feat(api): add additional scopes to the CatalogRequest

[paullatzelsperger]

What this PR changes/adds

adds an optional list additionalScopes to the CatalogRequest (CatalogApi DTO) and the CatalogRequestMessage (DSP message).
These additional scopes can be used by certain implementations of the IdentityService to enrich the generated token.

For example, in DCP we can use this to attach additional scope strings to the access_token, effectively giving permissions to request more credentials from the CredentialService.

Why it does that

being able to request additional VerifiableCredentials from the wallet

Further notes

• Since this is an alpha feature, it will be made available under the /v3.1alpha context url path
• the instanceof check in the DspHttpRemoteMessageDispatcherImpl might not be the most elegant solution, but it is the least impactful, and considering that we don't really foresee additionalScopes for any other DSP message, it seemed good enough.

Linked Issue(s)

Closes #4322

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Codecov Report

Attention: Patch coverage is 76.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 75.30%. Comparing base (7f20ba5) to head (b28db53).
Report is 349 commits behind head on main.

Files	Patch %	Lines
...anagement/catalog/v31alpha/CatalogApiV31alpha.java	0.00%	4 Missing ⚠️
...ain/java/org/eclipse/edc/spi/iam/RequestScope.java	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4348      +/-   ##
==========================================
+ Coverage   71.74%   75.30%   +3.56%     
==========================================
  Files         919     1055     +136     
  Lines       18457    21185    +2728     
  Branches     1037     1183     +146     
==========================================
+ Hits        13242    15954    +2712     
+ Misses       4756     4713      -43     
- Partials      459      518      +59     

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