Add basic support for Subject Alternative Name OtherName #882

Job	Run time
build-windows	8m 37s
Validate external types appearing in public API	1m 18s
Build rustls-cert-gen as a standalone package	37s
build (macOS-latest, stable)	58s
Clippy (--all-features)	5m 5s
build (ubuntu-latest, stable)	5m 34s
Measure coverage	38s
Clippy (--no-default-features --features ring)	5m 21s
Documentation (stable)	46s
build (ubuntu-latest, beta)	5m 39s
build (ubuntu-latest, nightly)	5m 32s
Documentation (beta)	54s
Clippy (--no-default-features --features aws_lc_rs)	5m 14s
build (ubuntu-latest, stable 7 months ago)	49s
Documentation (nightly)	42s
Format	6s
Clippy (--no-default-features --features aws_lc_rs,pem)	5m 0s
Documentation (stable 7 months ago)	46s
Check semver compatibility	1m 1s
	54m 37s

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