[backend] add source and target expectation signatures

[MarineLeM]

Proposed changes

• add signatures for source and target asset

Related issues

• Chunk 1 Improve expectation signatures to support network detections matching with collectors #3359

[codecov]

Codecov Report

Attention: Patch coverage is 32.85714% with 94 lines in your changes missing coverage. Please review.

Project coverage is 44.75%. Comparing base (f211bb5) to head (8f31739).
Report is 27 commits behind head on release/current.

Files with missing lines	Patch %	Lines
...c/main/java/io/openbas/utils/ExpectationUtils.java	23.58%	79 Missing and 2 partials ⚠️
...nbas/injectors/openbas/OpenBASImplantExecutor.java	0.00%	10 Missing ⚠️
.../io/openbas/rest/inject/service/InjectService.java	86.95%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/current    #3610      +/-   ##
=====================================================
+ Coverage              44.40%   44.75%   +0.35%     
- Complexity              2799     2806       +7     
=====================================================
  Files                    762      763       +1     
  Lines                  23138    23012     -126     
  Branches                1610     1593      -17     
=====================================================
+ Hits                   10274    10300      +26     
+ Misses                 12289    12135     -154     
- Partials                 575      577       +2     

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