refactor: separate DataPlaneClient and DataPlaneSelector

[ndr-brt]

What this PR changes/adds

extract selection feature from the DataPlaneClient component

Why it does that

preparatory refactoring for the issue #3631 , this way the DataPlaneSelectorService is directly used by the ProviderPushTransferDataFlowController that can use it to get the available transfer types. This way there's also a match with the ConsumerPullTransferDataFlowController, that also has the selector service as collaborator.

Further notes

• inlined the DataPlaneSelectorClient into the DataPlaneSelectorService, as they were doing the same thing. now the EmbeddedDataPlaneSelectorClient is the default implementation used by the api controller, and the Remote implementation can be used whenever the selector is deployed separately through the client module.
• inlined DataPlaneSelector as well, as it was doing nothing that couldn't be done easily by the EmbeddedDataPlaneSelectorService

Linked Issue(s)

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[codecov-commenter]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (a3ef0f1) 71.81% compared to head (6255da3) 71.82%.

Files	Patch %	Lines
...ava/org/eclipse/edc/spi/response/StatusResult.java	0.00%	6 Missing ⚠️
...tor/DataPlaneSelectorDefaultServicesExtension.java	0.00%	3 Missing ⚠️
...dataplane/selector/DataPlaneSelectorExtension.java	0.00%	2 Missing ⚠️
...plane/selector/RemoteDataPlaneSelectorService.java	86.66%	2 Missing ⚠️
...nector/dataplane/client/RemoteDataPlaneClient.java	81.81%	2 Missing ⚠️
...taplane/selector/spi/DataPlaneSelectorService.java	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3641      +/-   ##
==========================================
+ Coverage   71.81%   71.82%   +0.01%     
==========================================
  Files         917      914       -3     
  Lines       18395    18375      -20     
  Branches     1044     1042       -2     
==========================================
- Hits        13210    13198      -12     
+ Misses       4726     4717       -9     
- Partials      459      460       +1     

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