docs: complete loader context API doc and JSDoc #19761

Job	Run time
Check license of dependencies	10s
Pnpm Lockfile Check	35s
Check Source Changed	7s
Spell check	8s
Get Runner Labels / Get Runner Labels	1s
Rust Changes	5s
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Lint and format website	42s
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Test Linux / Bench	16m 55s
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Test Linux / E2E Testing	1m 27s
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Test Windows / Test Node 18	13m 40s
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	1h 3m 43s

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