♻️ Rewrite api package as standalone sdk

[aaronleopold]

This may seem insignificant or unnecessary on the surface, but this PR is really important for things down the road. The two big things this paves the way for are:

• Optional JWT/token-based auth (e.g. [FEATURE] Authenticate via LDAP, OAuth2, SAML etc. #246)
• A standalone TypeScript SDK which allows much easier 3rd-party integrations to eventually be created

The built-in web app and desktop app (WIP) will continue to use sessions, the mobile app however will now be able to swap to tokens. It's as simple as new Api(baseURL, 'tokens'). I will eventually add OPDS V2 to this new SDK, as well.

ℹ️ I want to note that while I did structure this package to be standalone, I don't have plans on publishing it to something like npm. If there winds up being an actual demand, sure I'll add some workflow to publish it. Otherwise, the effort isn't worth it if the built-in apps are the only consumers 😅

Super excited to see what this refactor allows down the road

[codecov]

Codecov Report

Attention: Patch coverage is 3.38983% with 57 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
apps/server/src/routers/api/mod.rs	0.00%	34 Missing ⚠️
apps/server/src/filter/basic_filter.rs	5.26%	18 Missing ⚠️
core/src/lib.rs	0.00%	2 Missing ⚠️
apps/server/src/routers/api/v1/library.rs	0.00%	1 Missing ⚠️
apps/server/src/routers/api/v1/media.rs	0.00%	1 Missing ⚠️
core/src/db/filter/smart_filter.rs	50.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
apps/server/src/routers/utoipa.rs	0.00% <ø> (ø)
core/src/db/query/pagination.rs	0.00% <ø> (ø)
crates/integrations/src/notifier/discord_client.rs	44.28% <ø> (+0.62%)	⬆️
...rates/integrations/src/notifier/telegram_client.rs	66.66% <ø> (+1.14%)	⬆️
apps/server/src/routers/api/v1/library.rs	0.00% <0.00%> (ø)
apps/server/src/routers/api/v1/media.rs	0.00% <0.00%> (ø)
core/src/db/filter/smart_filter.rs	60.46% <50.00%> (ø)
core/src/lib.rs	0.00% <0.00%> (ø)
apps/server/src/filter/basic_filter.rs	48.81% <5.26%> (ø)
apps/server/src/routers/api/mod.rs	0.00% <0.00%> (ø)

[aaronleopold]

I'm going to merge this to experimental knowing that there is almost certainly some things which I've likely missed. I'm working on improved filtering and sorting to include relations and aggregates, and want to minimize conflicts