rpc: re-use server builder per rpc interface #14744

Job	Run time
check-dependency-rules	9s
check-fail-ci	11s
check-markdown	16s
check-readme	3m 2s
check-workspace	42s
preflight / preflight	51s
preflight / ci-versions	1m 7s
check-rust-feature-propagation	2m 13s
fmt	1m 16s
check-toml-format	1m 5s
test-rust-features	2m 11s
check-umbrella	2m 25s
All quick checks passed	1s
	15m 29s

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