Add deprecation annotations for RPCs marked "deprecated=true" #788

Job	Run time
build-library-ios	3m 17s
build-eliza-swiftpm-example	4m 36s
build-eliza-cocoapods-example	1m 22s
build-library-macos	4m 15s
build-library-tvos	4m 19s
build-library-watchos	4m 14s
build-plugin-and-generate	1m 11s
run-conformance-tests	2m 40s
run-swiftlint	13s
validate-license-headers	16s
run-unit-tests	2m 44s
	29m 7s

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