Rust

Add `Point::serialized_len` #363

Job	Run time
check-nostd	23s
check-all	58s
check-alloc	19s
check	53s
check-changelog	2s
build-wasm	4m 18s
build-wasm-nostd	33s
check-doc	43s
check-semver (generic-ec, all-features)	2m 59s
clippy	57s
check-semver (generic-ec, only-explicit-features)	2m 37s
check-semver (generic-ec-core, all-features)	2m 50s
clippy-nostd	42s
check-semver (generic-ec-core, only-explicit-features)	2m 37s
clippy-tests	43s
check-semver (generic-ec-curves, all-features)	2m 43s
fmt	6s
check-semver (generic-ec-curves, only-explicit-features)	2m 27s
test	1m 10s
check-semver (generic-ec-zkp, all-features)	2m 37s
check-semver (generic-ec-zkp, only-explicit-features)	2m 33s
	33m 10s

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