Replace Path objects with str

[augelu-tng]

This PR replaces the usage of pathlib.Path objects with plain strings for performance improvements.
Creating the cmd graph on the tinyconfig using Path objects takes ~13 seconds:

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000   13.452   13.452 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:32(build_cmd_graph)
        1    0.000    0.000   13.452   13.452 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:34(<listcomp>)
 237524/1    0.568    0.000   13.452   13.452 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:41(build_cmd_graph_node)
      920    0.286    0.000    7.719    0.008 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:102(_parse_cmd_file)
  1202765    0.831    0.000    5.211    0.000 /usr/lib/python3.10/pathlib.py:569(_parse_args)
  1202765    2.775    0.000    4.120    0.000 /usr/lib/python3.10/pathlib.py:56(parse_parts)
   714104    0.275    0.000    3.835    0.000 /usr/lib/python3.10/pathlib.py:957(__new__)
   714104    0.326    0.000    3.560    0.000 /usr/lib/python3.10/pathlib.py:589(_from_parts)
   480113    0.119    0.000    2.744    0.000 /usr/lib/python3.10/pathlib.py:853(__truediv__)
   480113    0.328    0.000    2.626    0.000 /usr/lib/python3.10/pathlib.py:615(_make_child)
   475043    1.004    0.000    2.103    0.000 /usr/lib/python3.10/posixpath.py:338(normpath)
      505    0.276    0.001    1.776    0.004 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/deps_parser.py:13(parse_deps)
  921/920    0.004    0.000    1.166    0.001 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/savedcmd_parser.py:562(parse_commands)
  1429834    0.231    0.000    0.897    0.000 {built-in method posix.fspath}
   965277    0.454    0.000    0.704    0.000 /usr/lib/python3.10/pathlib.py:621(__str__)
   721113    0.151    0.000    0.678    0.000 /usr/lib/python3.10/pathlib.py:631(__fspath__)
      919    0.008    0.000    0.674    0.001 /usr/lib/python3.10/shlex.py:305(split)
    51916    0.010    0.000    0.661    0.000 /usr/lib/python3.10/shlex.py:299(__next__)
      504    0.002    0.000    0.660    0.001 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/savedcmd_parser.py:200(_parse_gcc_or_clang_command)
    51916    0.015    0.000    0.652    0.000 /usr/lib/python3.10/shlex.py:101(get_token)

A lot of time is spent in the pathlib library simply converting between str and Path objects and performing simple path operations.

With the changes in this PR the total runtime gets more than halved to <5 seconds while the generated sbom.spdx.json remains the same:

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    4.726    4.726 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:32(build_cmd_graph)
        1    0.000    0.000    4.726    4.726 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:34(<listcomp>)
 237524/1    0.267    0.000    4.726    4.726 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:41(build_cmd_graph_node)
      920    0.160    0.000    2.932    0.003 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_graph.py:102(_parse_cmd_file)
   475043    0.881    0.000    1.258    0.000 /usr/lib/python3.10/posixpath.py:338(normpath)
  921/920    0.004    0.000    1.198    0.001 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/savedcmd_parser.py:562(parse_commands)
      919    0.010    0.000    0.687    0.001 /usr/lib/python3.10/shlex.py:305(split)
      504    0.003    0.000    0.677    0.001 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/savedcmd_parser.py:200(_parse_gcc_or_clang_command)
    51916    0.013    0.000    0.673    0.000 /usr/lib/python3.10/shlex.py:299(__next__)
    51916    0.016    0.000    0.660    0.000 /usr/lib/python3.10/shlex.py:101(get_token)
    51916    0.540    0.000    0.644    0.000 /usr/lib/python3.10/shlex.py:133(read_token)
   476313    0.360    0.000    0.577    0.000 /usr/lib/python3.10/posixpath.py:71(join)
      923    0.003    0.000    0.473    0.001 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/savedcmd_parser.py:533(_split_commands)
     1324    0.402    0.000    0.469    0.000 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/savedcmd_parser.py:493(_find_first_top_level_command_separator)
      505    0.176    0.000    0.452    0.001 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/deps_parser.py:13(parse_deps)
      920    0.162    0.000    0.447    0.000 /home/luis/code/WSKernelSbom/KernelSbom/sbom_analysis/profiling/../../sbom/lib/sbom/cmd/cmd_file_parser.py:22(parse_cmd_file)
   975073    0.250    0.000    0.250    0.000 {method 'match' of 're.Pattern' objects}
  4149642    0.204    0.000    0.204    0.000 {method 'append' of 'list' objects}
   237516    0.093    0.000    0.177    0.000 /usr/lib/python3.10/posixpath.py:60(isabs)
   717736    0.102    0.000    0.152    0.000 /usr/lib/python3.10/posixpath.py:41(_get_sep)

Successful Testrun