Reorganize Masonry modules #2734

Job	Run time
cargo check (aarch64-android)	20s
cargo check (msrv) (wasm32)	15s
cargo check (msrv) (windows-latest)	1m 57s
cargo clippy (windows-latest)	5m 31s
cargo check (msrv) (macos-latest)	49s
cargo clippy (wasm32)	2m 4s
cargo clippy (macos-latest)	2m 36s
cargo doc	41s
cargo check (msrv) (ubuntu-latest)	45s
cargo clippy (ubuntu-latest)	3m 17s
formatting	38s
cargo miri (unsafe tree_arena)	42s
Prime LFS Cache	5s
cargo test (wasm32)	19s
typos	5s
cargo test (windows-latest)	3m 37s
cargo test (macos-latest)	1m 45s
cargo test (ubuntu-latest)	3m 48s
	29m 14s

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