feat: support new flagd.evaluation and flagd.sync schemas

[bacherfl]

Closes #1029

This PR introduces support for the newly introduced evaluation and sync schemas.

Supporting both the old and new schemas involves some duplication, but I tried to keep it as minimal as possible. I'm of course open for suggestions for any ideas on how to make this simpler :)

See reasoning for new naming here.

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[codecov]

Codecov Report

Attention: 52 lines in your changes are missing coverage. Please review.

Comparison is base (dea8c78) 72.93% compared to head (8102fcf) 73.53%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...e/pkg/service/flag-evaluation/flag_evaluator_v2.go	75.91%	45 Missing and 1 partial ⚠️
...kg/service/flag-evaluation/flag_evaluator_types.go	90.90%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1083      +/-   ##
==========================================
+ Coverage   72.93%   73.53%   +0.59%     
==========================================
  Files          31       32       +1     
  Lines        2864     3113     +249     
==========================================
+ Hits         2089     2289     +200     
- Misses        670      717      +47     
- Partials      105      107       +2     

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[toddbaert]

@bacherfl since you're going through this, would you mind sprinkling references to this new issue I created where relevant? That way it'll be super easy to make sure that we remove all the right stuff by just searching for 1088.

[toddbaert]

Closes #1029

This PR introduces support for the newly introduced evaluation and sync schemas.

Supporting both the old and new schemas involves some duplication, but I tried to keep it as minimal as possible. I'm of course open for suggestions for any ideas on how to make this simpler :)

I think the effort we should put into reducing duplication that we know will be deleted should be low, so unless the solutions are very easy, I'm fine with it as is.

[toddbaert]

Can you update all e2e tests and documentation to use the new paths? I think a good approach might be to simply search for schema.v1.Service and sync.v1 and replace them with the new paths and RPC names. This way new and old users will be more likely to use the non-deprecated stuff.

[toddbaert]

Manually tested and this works for me.

I have 2 small concerns: this and this.

This is optional, but would be nice to make the subsequent removal easier later.

We also could consider adding a middleware (or something like that) that would log a one-time warning when the old endpoint is used.

[bacherfl]

Manually tested and this works for me.

I have 2 small concerns: this and this.

This is optional, but would be nice to make the subsequent removal easier later.

We also could consider adding a middleware (or something like that) that would log a one-time warning when the old endpoint is used.

thanks for the review, I will adapt the PR accordingly

[toddbaert]

Looks great! Thanks a lot!