backend/bookmarks: add handler for playqueue related operations

[vnghia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 51.21951% with 20 lines in your changes missing coverage. Please review.

Project coverage is 81.06%. Comparing base (5873272) to head (1df21a1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
nghe-backend/src/route/bookmarks/get_playqueue.rs	22.22%	7 Missing ⚠️
nghe-api/src/bookmarks/get_playqueue.rs	0.00%	3 Missing ⚠️
nghe-backend/src/orm/playqueues.rs	72.72%	0 Missing and 3 partials ⚠️
nghe-backend/src/route/bookmarks/mod.rs	0.00%	3 Missing ⚠️
nghe-api/src/bookmarks/save_playqueue.rs	0.00%	2 Missing ⚠️
nghe-backend/src/lib.rs	0.00%	1 Missing ⚠️
nghe-backend/src/route/bookmarks/save_playqueue.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #524      +/-   ##
==========================================
- Coverage   81.30%   81.06%   -0.24%     
==========================================
  Files         194      200       +6     
  Lines        5257     5297      +40     
  Branches     5257     5297      +40     
==========================================
+ Hits         4274     4294      +20     
- Misses        640      657      +17     
- Partials      343      346       +3     

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