fix: improve lyrics fetching and query encoding for special characters

[Mapleshade20]

This pull request includes several changes to improve lyrics fetching.

Changelogs

• Specific to LRCLIB

1. Use /api/get instead of /api/search for searching LRCLIB songs, in accordance with official docs recommendation.
2. Add a boolean property instrumental to the struct LrclibSong. Fix lyrics parser so that it returns an empty array for instrumental songs, which gets "It is instrumental" correctly displayed. Before this change, empty lyrics would trigger a Decode Error.
3. Keep parenthesis and hyphen in the song title upon the first query. If nothing matches, fallback to a stripped title query. This ensures precise matches for songs like "Contact - Sped Up" or "Wake Me Up (Nightcore)".

• General

1. Percent-encode special characters for all keys and values in queries. This prevents query errors for songs like "He & I" or "Hello? Anyone?"

A Small Breaking Change: enhance 'queryString' dictionary extension

• Models/Extensions/CharacterSet+Extension.swift: Added a new CharacterSet extension to define a stricter set of allowed characters for URL query strings.
• Models/Extensions/Dictionary+Extension.swift: Updated the queryString property to use the new urlQueryAllowedStrict character set for encoding keys and values.

Issue Reference

Closes #411

Test

• My Test Method: Use GitHub workflow to build. Inject the dylib into Spotify app.
• Test Result: Lyrics from LRCLIB, Genius, and Musixmatch sources works well. Many previously failed queries can be successfully performed now, and mismatched lyrics occur much less likely.

[whoeevee]

incredibly nice