Rust

expose some unexposed values for jsonrpc (#103) #274

Job	Run time
linting	48s
build	2m 35s
cross-testing (stable, ubuntu-latest)	1m 41s
cross-testing (stable, windows-latest)	3m 0s
cross-testing (stable, macos-latest)	3m 40s
cross-testing (nightly, ubuntu-latest)	1m 31s
cross-testing (nightly, windows-latest)	3m 37s
cross-testing (nightly, macos-latest)	3m 12s
cross-testing (1.64, ubuntu-latest)	1m 22s
cross-testing (1.64, windows-latest)	3m 43s
cross-testing (1.64, macos-latest)	3m 30s
	28m 39s

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