refactor!: Separate Signature from FuncValueType by parametrizing Type(/Row)/etc. #1381

Job	Run time
Check for changes in Rust files	5s
check	59s
Build benchmarks 🏋️	5m 13s
tests (Rust 1.75)	1m 41s
tests (Rust beta)	1m 59s
tests (Rust nightly)	1m 25s
tests (Rust stable, no features)	1m 31s
tests (Rust stable, all features)	1m 27s
Required checks 🦀	1s
coverage	2m 27s
	16m 48s

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