Apply is/has naming convention for flags and methods #2618

Job	Run time
cargo check (msrv) (wasm32)	16s
cargo check (msrv) (windows-latest)	1m 45s
cargo clippy (windows-latest)	5m 27s
cargo check (msrv) (macos-latest)	1m 5s
cargo check (aarch64-android)	20s
cargo clippy (macos-latest)	4m 10s
cargo clippy (wasm32)	2m 1s
cargo check (msrv) (ubuntu-latest)	44s
cargo clippy (ubuntu-latest)	3m 11s
cargo doc	1m 54s
formatting	36s
Prime LFS Cache	4s
cargo test (wasm32)	19s
typos	5s
cargo test (windows-latest)	2m 37s
cargo test (macos-latest)	1m 33s
cargo test (ubuntu-latest)	3m 34s
	29m 41s

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