[backend] send encoded command into implant

[MarineLeM]

Proposed changes

Improvements :

• Move inject service file under rest>inject>service
• Remove useless table injects_payloads ( legacy )
• Remove hardcoded payload type comparisons (replace with enum values).

Code related to the issue :

• Add new endpoint @GetMapping(INJECT_URI + "/{injectId}/executable-payload")
  used to get payload with encoded command

Related issues

• Closes Raise the interpolation and obfuscation of commands to the OpenBAS platform level #1831

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion) => in progress
• Where necessary I refactored code to improve the overall quality

Further comments

⚠️ need to be merge with OpenBAS-Platform/implant#22

[codecov]

Codecov Report

Attention: Patch coverage is 67.08861% with 26 lines in your changes missing coverage. Please review.

Please upload report for BASE (release/1.10.0@ad4a804). Learn more about missing BASE report.
Report is 1 commits behind head on release/1.10.0.

Files with missing lines	Patch %	Lines
...s/rest/inject/service/ExecutableInjectService.java	68.11%	15 Missing and 7 partials ⚠️
.../main/java/io/openbas/rest/payload/PayloadApi.java	0.00%	1 Missing and 1 partial ⚠️
.../io/openbas/injectors/caldera/CalderaExecutor.java	0.00%	1 Missing ⚠️
...ectors/caldera/service/CalderaInjectorService.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             release/1.10.0    #1935   +/-   ##
=================================================
  Coverage                  ?   34.27%           
  Complexity                ?     1712           
=================================================
  Files                     ?      574           
  Lines                     ?    16792           
  Branches                  ?      977           
=================================================
  Hits                      ?     5755           
  Misses                    ?    10770           
  Partials                  ?      267           

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[MarineLeM]

@Dimfacion I took into account your observations. Please let me know if you notice anything else. Thank you!🙏