Rework Processstateclient library

[eelcoem]

• Replace IPC by Ringbuffer
• pull all relevant files into one library
• Introduce interfaces to facilitate testing

Closes #39

[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run //:license-check

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[License Check Output]
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INFO: Running command line: bazel-bin/license.check.license_check ./formatted.txt <args omitted>
usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
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       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
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[github-actions]

The created documentation from the pull request is available at: docu-html

[FScholPer]

Can we at least have some basic unit test coverage

[S-MOHAMD]

Can we at least have some basic unit test coverage

I would recommend basic UT but not intensive test cases creation at the moment considering the upcoming refactoring.

[FScholPer]

WilliamRoebuck please don't forget to sign the eca in your eclipse account

[eelcoem]

Can we at least have some basic unit test coverage

Added some basic UTs for the ProcessStateClient library

[FScholPer]

@eelcoem can you please fix formatting?

[paulquiring]

tests look good.