Rename `JoinRequest` in the SDK crates to `KnockRequest`, make `Room:… #13210

Job	Run time
Generate Crypto FFI Apple XCFramework	4m 56s
Run Complement Crypto tests / tests	8m 0s
xtask / xtask-🐧	6s
xtask / xtask-🍏	6s
matrix-rust-components-swift	14m 20s
Test UniFFI bindings generation	2m 3s
matrix-rust-components-kotlin	5m 27s
	34m 58s

Provide feedback