Implements createrawtransaction RPC method #2182

Job	Run time
Check deny.toml bans	44s
Check deny.toml bans --features default-release-binaries	47s
Check deny.toml bans --all-features	42s
Check deny.toml sources	45s
Check deny.toml sources --features default-release-binaries	44s
Check deny.toml sources --all-features	48s
Check Cargo.lock is up to date	8m 44s
Install zebrad from lockfile without cache on ubuntu-latest	8m 45s
Test stable on ubuntu-latest	40m 41s
Check for unused dependencies	7s
Test beta on ubuntu-latest	40m 22s
Test stable on macos-latest	41m 17s
Test stable on windows-latest	59m 52s
Test beta on windows-latest	1h 1m 14s
Open or update issues for OS integration failures	0s
	4h 25m 32s

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