feat: Introduce boot-lib and http-lib modules

[jimmarino]

As described in #4028 and #4029 this PR introduces the boot-lib and http-lib modules. Specifically:

• It breaks the cyclic dependency between connector-core and Junit by moving EdcHttpClientImpl into the http-lib modules and getFreePorts() to a utility method in the core util module.
• Moves the InMemoryVault implementation to the boot-lib module so that it can be referenced without exposing visibility to core services
• Starts to clean up dependencies on connector-core. These will be refined in subsequent PRs.

Linked Issue(s)

Closes #4029

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.18519% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 62.28%. Comparing base (7f20ba5) to head (0bf4621).
Report is 159 commits behind head on main.

Files	Patch %	Lines
...l/src/main/java/org/eclipse/edc/util/io/Ports.java	83.33%	1 Missing and 3 partials ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4030      +/-   ##
============================================
- Coverage     71.74%   62.28%   -9.47%     
- Complexity        0     4240    +4240     
============================================
  Files           919      989      +70     
  Lines         18457    20053    +1596     
  Branches       1037     1126      +89     
============================================
- Hits          13242    12490     -752     
- Misses         4756     7136    +2380     
+ Partials        459      427      -32     

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[wolf4ood]

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