chore(knocking): Add `reason` and `server_names` to `Client::knock` #12141

Job	Run time
Generate Crypto FFI Apple XCFramework	4m 56s
Run Complement Crypto tests / tests	9m 43s
xtask / xtask-🐧	5s
xtask / xtask-🍏	11s
matrix-rust-components-swift	7m 5s
matrix-rust-components-kotlin	6m 44s
Test UniFFI bindings generation	3m 27s
	32m 11s

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