[WIP] Links API

[allouis]

This expose the /links endpoint on the Admin API, which is filterable by Post ID.

We also add in memory repository implementations, just because they exist locally. I don't think we should necessarily merge them with this PR, but it is what I was building this API against initially.

Missing tests & some small bug fixes

[codecov[bot]]

Codecov Report

Base: 53.33% // Head: 53.28% // Decreases project coverage by -0.04% :warning:

Coverage data is based on head (6aa1764) compared to base (98fc808). Patch coverage: 28.57% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15446      +/-   ##
==========================================
- Coverage   53.33%   53.28%   -0.05%     
==========================================
  Files        1418     1419       +1     
  Lines       89465    89662     +197     
  Branches     9650     9656       +6     
==========================================
+ Hits        47713    47774      +61     
- Misses      40797    40937     +140     
+ Partials      955      951       -4     

Impacted Files	Coverage Δ
ghost/admin/app/controllers/posts/analytics.js	0.00% <0.00%> (ø)
...ervices/link-redirection/LinkRedirectRepository.js	0.00% <0.00%> (ø)
...ore/core/server/services/link-redirection/index.js	0.00% <0.00%> (ø)
ghost/core/core/server/models/link-redirect.js	24.61% <9.37%> (-14.78%)	:arrow_down:
.../core/server/services/link-click-tracking/index.js	21.42% <11.11%> (-1.43%)	:arrow_down:
...ervices/link-click-tracking/LinkClickRepository.js	39.28% <22.22%> (-9.44%)	:arrow_down:
...services/link-click-tracking/PostLinkRepository.js	50.00% <37.14%> (-17.86%)	:arrow_down:
ghost/link-tracking/lib/FullPostLink.js	61.11% <61.11%> (ø)
...host/link-tracking/lib/LinkClickTrackingService.js	59.84% <77.77%> (+2.83%)	:arrow_up:
ghost/link-redirects/lib/LinkRedirectsService.js	55.55% <100.00%> (+0.49%)	:arrow_up:
... and 5 more

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[SimonBackx]

I moved the in memory repositories to a different PR for now: https://github.com/TryGhost/Ghost/pull/15455