refactor!: Separate Signature from FuncValueType by parametrizing Type(/Row)/etc. #1388

Job	Run time
Check for changes in Rust files	3s
check	51s
Build benchmarks 🏋️	5m 31s
tests (Rust 1.75)	1m 43s
tests (Rust beta)	1m 40s
tests (Rust stable, all features)	1m 1s
tests (Rust stable, no features)	1m 4s
tests (Rust nightly)	1m 32s
Required checks 🦀	1s
coverage	2m 55s
	16m 21s

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