Updated source grouping to use known referrers

[rishabhgrg]

Instead of collecting and deciding on the Medium/Source for all of these ourselves, we will be leveraging Plausible's already well organized list here for grouping incoming referrers.

• adds new package with known referrers list from Plausible's list
  • transforms yaml list from Plausible to JSON format, and flattened out with each domain/url as a separate key
• updates attribution logic to use known referrers list for grouping Source and Medium

[codecov]

Codecov Report

Base: 53.08% // Head: 53.17% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (cc02d60) compared to base (b2b6be9).
Patch coverage: 96.42% of modified lines in pull request are covered.

❗ Current head cc02d60 differs from pull request most recent head c1f2cc1. Consider uploading reports for the commit c1f2cc1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15432      +/-   ##
==========================================
+ Coverage   53.08%   53.17%   +0.08%     
==========================================
  Files        1410     1406       -4     
  Lines       88515    88433      -82     
  Branches     9554     9570      +16     
==========================================
+ Hits        46988    47024      +36     
+ Misses      40573    40457     -116     
+ Partials      954      952       -2     

Impacted Files	Coverage Δ
...host/member-attribution/lib/referrer-translator.js	96.58% <96.42%> (+5.87%)	⬆️
ghost/link-tracking/lib/link-tracking.js	47.82% <0.00%> (-52.18%)	⬇️
.../core/server/services/link-click-tracking/index.js	0.00% <0.00%> (-22.86%)	⬇️
...e/core/server/services/member-attribution/index.js	0.00% <0.00%> (-17.78%)	⬇️
ghost/core/core/boot.js	21.25% <0.00%> (-0.09%)	⬇️
...ore/core/server/services/link-redirection/index.js	0.00% <0.00%> (ø)
...ervices/link-click-tracking/LinkClickRepository.js
...host/link-tracking/lib/LinkClickTrackingService.js
ghost/link-replacer/lib/LinkReplacer.js
...ervices/link-redirection/LinkRedirectRepository.js
... and 10 more

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[rishabhgrg]

@ErisDS The main thing I'd love to get your 👀 on here is the new @tryghost/referrers package and the pattern it uses to expose the JSON with list of known referrers for attribution service. Currently it's following the structure same as Nameservers package, but was wondering if it will make sense for it to use .js format to expose the list which is closer to pattern used for rest of monorepo packages.

Update: Discussed on Slack, will keep the JSON pattern for now and we can revisit this in future if any changes are needed