feat(flotilla): Added concat

[rohitkulshreshtha]

Added concat implementation for flotilla.

[codecov]

Codecov Report

Attention: Patch coverage is 73.62637% with 24 lines in your changes missing coverage. Please review.

Project coverage is 78.66%. Comparing base (01fca4a) to head (a4e128c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/daft-distributed/src/pipeline_node/concat.rs	70.37%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4748      +/-   ##
==========================================
- Coverage   78.68%   78.66%   -0.02%     
==========================================
  Files         877      878       +1     
  Lines      122583   122672      +89     
==========================================
+ Hits        96449    96496      +47     
- Misses      26134    26176      +42     

Files with missing lines	Coverage Δ
src/daft-distributed/src/pipeline_node/mod.rs	86.74% <ø> (ø)
...rc/daft-distributed/src/pipeline_node/translate.rs	94.93% <100.00%> (+0.45%)	⬆️
src/daft-distributed/src/stage/stage_builder.rs	96.70% <100.00%> (ø)
src/daft-distributed/src/pipeline_node/concat.rs	70.37% <70.37%> (ø)

... and 10 files with indirect coverage changes

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