fix: Fix usage of default @Provider methods in IdentityDidCoreExtension

[bscholtes1A]

What this PR changes/adds

Make some @Provider methods non-default in IdentityDidCoreExtension as this is causing non-deterministic dependency injection in IdentityHub project.

Why it does that

Default @Provider methods depending on injected services might be invoked while these services are not yet initialized.

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• assigned appropriate label? (exclude from changelog with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

[marcgs]

How is this related to this change?

[codecov-commenter]

Codecov Report

Merging #1792 (8cc5914) into main (765983d) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #1792      +/-   ##
==========================================
- Coverage   67.82%   67.80%   -0.02%     
==========================================
  Files         795      800       +5     
  Lines       16899    16979      +80     
  Branches     1078     1080       +2     
==========================================
+ Hits        11461    11512      +51     
- Misses       4969     4997      +28     
- Partials      469      470       +1     

Impacted Files	Coverage Δ
...aceconnector/iam/did/IdentityDidCoreExtension.java	66.66% <80.00%> (+8.60%)	⬆️
...ypes/domain/contract/offer/ContractDefinition.java	77.77% <0.00%> (-3.00%)	⬇️
...taspaceconnector/spi/types/domain/asset/Asset.java	88.57% <0.00%> (-2.06%)	⬇️
...tor/spi/types/domain/transfer/TransferProcess.java	67.85% <0.00%> (-0.03%)	⬇️
.../dataspaceconnector/spi/entity/StatefulEntity.java	0.00% <0.00%> (ø)
...clipse/dataspaceconnector/policy/model/Policy.java	81.15% <0.00%> (ø)
...onnector/policy/model/PolicyRegistrationTypes.java	0.00% <0.00%> (ø)
...nnector/sql/assetindex/schema/AssetStatements.java	100.00% <0.00%> (ø)
...iation/ConsumerContractNegotiationManagerImpl.java	87.38% <0.00%> (ø)
...main/contract/negotiation/ContractNegotiation.java	0.00% <0.00%> (ø)
... and 32 more

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