Adding consumer for uSubscription service compatible with up-spec alpha4

[lukas-he]

This PR reopens the PR #292. In addition, the Consumer is upgraded to the release alpha4 of the spec. The upgrade to alpha4 came with changes in the usubscription.proto .

[github-actions]

Code coverage report is ready! 📈

• Code Coverage Percentage: 92.40%
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[PLeVasseur]

@lukas-he -- ran the workflows, looks like a lint issue came up. Didn't investigate from my end.

Ah, due to this? #307

[lukas-he]

@lukas-he -- ran the workflows, looks like a lint issue came up. Didn't investigate from my end.

Ah, due to this? #307

No, the errors from #307 are also fixed here (to look if it keeps failing despite fixing it). #307 resolved the linting errors. Here it is failing due to linting warnings. There are lots of warnings, so would it make sense to resolve all clang-tidy warnings in a separate issue and approve despite them?

[PLeVasseur]

No, the errors from #307 are also fixed here (to look if it keeps failing despite fixing it). #307 resolved the linting errors.

Okay, got it.

Here it is failing due to linting warnings. There are lots of warnings, so would it make sense to resolve all clang-tidy warnings in a separate issue and approve despite them?

Sure, would you like to open an issue for resolving the warnings?

Also -- I think this needs to be rebased, then we can spin the CI again and go for a merge.

[github-actions]

Code coverage report is ready! 📈

• Code Coverage Percentage: 92.40%
• Code Coverage Report: View Coverage Report

[PLeVasseur]

LGTM. Seems to be a cleanly opened version of #292 which went through code review already.