feat: Relax GrpcMethod lifetime #2338

Job	Run time
Check unused dependencies (ubuntu-latest)	6m 22s
rustfmt	6s
Check unused dependencies (macOS-latest)	8m 24s
Check MSRV	3m 38s
Check unused dependencies (windows-latest)	8m 20s
Interop Tests (ubuntu-latest)	3m 1s
cargo-deny check	21s
Interop Tests (macOS-latest)	4m 39s
Interop Tests (windows-latest)	5m 31s
test (ubuntu-latest)	5m 30s
test (macOS-latest)	7m 34s
check (ubuntu-latest)	4m 16s
test (windows-latest)	7m 29s
codegen	2m 36s
check (macOS-latest)	7m 34s
check (windows-latest)	5m 28s
	1h 20m 49s

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