Migrate to pki-types ServerName #1157

Job	Run time
Clippy	31s
Check cross compilation targets	40s
Format	14s
Cargo Deny	15s
MSRV	3m 58s
Cargo Package	14s
Check for documentation errors (stable)	25s
Check for documentation errors (beta)	28s
Build+test (--all-features, stable)	50s
Check for documentation errors (nightly)	26s
Build+test (stable, ubuntu-20.04)	39s
Check semver compatibility	27s
Build+test (--features=alloc, stable, ubuntu-20.04)	33s
Build+test (--no-default-features, stable, ubuntu-20.04)	24s
Build+test (--no-default-features --features alloc,std, stable, ubuntu-20.04)	24s
Build+test (--all-features, --release, stable, ubuntu-20.04)	1m 24s
Validate external types appearing in public API	1m 6s
Measure coverage	48s
Build+test (--all-features, nightly, ubuntu-20.04)	40s
Build+test (--all-features, beta, ubuntu-20.04)	52s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, macos-latest)	2m 7s
Feature Powerset	36s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, windows-latest)	3m 6s
Verify that no-std modes do not rely on libstd (--no-default-features)	13s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, ubuntu-latest)	45s
Verify that no-std modes do not rely on libstd (--no-default-features --features alloc)	12s
	22m 17s

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