build

refactor!: make `VLenV2Codec` private, add `VLen{Array,Bytes,Utf8}Codec` #872

Job	Run time
build_and_test_windows	3m 30s
clippy	41s
build_and_test_macos (macos-13)	2m 5s
build_and_test_macos (macos-latest)	58s
codecov	4m 31s
fmt	30s
build_and_test (stable, --features "")	2m 3s
minimal-versions	3m 1s
build_and_test (stable, --all-features)	2m 16s
semver	1m 37s
build_and_test (stable, --no-default-features)	1m 27s
build_and_test (1.77, --features "")	2m 39s
build_and_test (1.77, --all-features)	2m 22s
build_and_test (1.77, --no-default-features)	1m 27s
build_and_test (beta, --features "")	1m 57s
build_and_test (beta, --all-features)	2m 47s
build_and_test (beta, --no-default-features)	1m 26s
build_and_test (nightly, --features "")	2m 31s
build_and_test (nightly, --all-features)	2m 49s
build_and_test (nightly, --no-default-features)	2m 21s
	42m 58s

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