Apply is/has naming convention for flags and methods #2626

Job	Run time
cargo clippy (wasm32)	2m 2s
formatting	42s
Prime LFS Cache	6s
cargo clippy (windows-latest)	4m 39s
cargo clippy (macos-latest)	2m 18s
cargo check (msrv) (wasm32)	17s
cargo clippy (ubuntu-latest)	3m 7s
cargo check (msrv) (windows-latest)	1m 39s
cargo check (msrv) (macos-latest)	41s
cargo check (aarch64-android)	24s
cargo check (msrv) (ubuntu-latest)	40s
cargo doc	39s
typos	4s
cargo test (wasm32)	22s
cargo test (windows-latest)	2m 42s
cargo test (macos-latest)	1m 42s
cargo test (ubuntu-latest)	3m 22s
	25m 26s

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