Move value limitations away from type_setter #1160

Job	Run time
Build docs	1m 18s
Rustfmt	12s
Clippy	48s
Test (MSRV)	1m 17s
Test (stable)	2m 1s
Test (beta)	2m 3s
Test (nightly)	1m 50s
Test (macOS)	1m 45s
Test (Windows)	3m 42s
Test (no features)	1m 13s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 20s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 22s
	18m 51s

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