ci: add lockfile and use rust-bitcoin-maintainer-tools CI setup #545

Job	Run time
Test - stable toolchain (recent)	1m 56s
Test - stable toolchain (minimal)	2m 2s
Docs - stable toolchain (recent)	33s
Check WASM	31s
Prepare	6s
Test - MSRV (recent)	2m 33s
Test - nightly toolchain (minimal)	1m 59s
Test - MSRV (minimal)	2m 39s
Lint - nightly toolchain (recent)	40s
Test - nightly toolchain (recent)	1m 54s
Docs - nightly toolchain (recent)	34s
	15m 27s

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