Simplify `NameIterator` #2130

Job	Run time
Clippy	58s
Cargo Deny	17s
Cargo Package	59s
Check for documentation errors (stable)	57s
Check for documentation errors (beta)	57s
Format	11s
Check for documentation errors (nightly)	58s
Check cross compilation targets	40s
Build+test (--all-features, stable)	1m 19s
MSRV	54s
Build+test (stable, ubuntu-latest)	51s
Validate external types appearing in public API	56s
Measure coverage	1m 10s
Build+test (--features=alloc, stable, ubuntu-latest)	51s
Build+test (--no-default-features, stable, ubuntu-latest)	33s
Verify that no-std modes do not rely on libstd (--no-default-features)	15s
Check semver compatibility	1m 3s
Build+test (--no-default-features --features alloc,std, stable, ubuntu-latest)	38s
Verify that no-std modes do not rely on libstd (--no-default-features --features alloc)	14s
Build+test (--all-features, --release, stable, ubuntu-latest)	2m 3s
Build+test (--all-features, nightly, ubuntu-latest)	1m 11s
Build+test (--all-features, beta, ubuntu-latest)	1m 12s
Build+test (--no-default-features --features alloc,std,aws-lc-rs, stable, macos-latest)	52s
Feature Powerset	1m 8s
Build+test (--no-default-features --features alloc,std,aws-lc-rs, stable, windows-latest)	3m 16s
Build+test (--no-default-features --features alloc,std,aws-lc-rs, stable, ubuntu-latest)	47s
	25m 10s

Provide feedback