refactor(test): provide better shaped junit extensions for testing runtimes

[ndr-brt]

What this PR changes/adds

Extracts an EmbeddedRuntime, an extension of BaseRuntime that runs into a java thread and provides additional features like injectable ServiceExtensions and injectable services.
Provides 3 extensions:

• RuntimeExtension: abstract extension that defines an embedded runtime to be executed in a junit test.
• RuntimePerMethodExtension: start and stop the runtime on every test
• RuntimePerClassExtension: start and stop the runtime once in a test class

Why it does that

test refactoring

Further notes

• EdcExtension, EdcRuntimeExtension and EdcClassRuntimeExtension have been deprecated.
• The new extensions have been applied only once per case, the replacement of all the deprecated extensions will happen in subsequent PRs (not necessarily done in the upcoming days)

Linked Issue(s)

Closes #4233

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 8.58896% with 149 lines in your changes missing coverage. Please review.

Project coverage is 75.00%. Comparing base (7f20ba5) to head (4d78691).
Report is 289 commits behind head on main.

Files	Patch %	Lines
.../eclipse/edc/junit/extensions/EmbeddedRuntime.java	0.00%	72 Missing ⚠️
...eclipse/edc/junit/extensions/RuntimeExtension.java	0.00%	26 Missing ⚠️
...dc/junit/extensions/MultiSourceServiceLocator.java	0.00%	17 Missing ⚠️
...org/eclipse/edc/junit/extensions/EdcExtension.java	0.00%	14 Missing ⚠️
...edc/junit/extensions/RuntimePerClassExtension.java	0.00%	8 Missing ⚠️
...dc/junit/extensions/RuntimePerMethodExtension.java	0.00%	8 Missing ⚠️
...g/eclipse/edc/boot/system/runtime/BaseRuntime.java	82.35%	2 Missing and 1 partial ⚠️
...ipse/edc/junit/extensions/EdcRuntimeExtension.java	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4234      +/-   ##
==========================================
+ Coverage   71.74%   75.00%   +3.25%     
==========================================
  Files         919     1041     +122     
  Lines       18457    20735    +2278     
  Branches     1037     1164     +127     
==========================================
+ Hits        13242    15552    +2310     
+ Misses       4756     4673      -83     
- Partials      459      510      +51     

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[wolf4ood]

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