feat(reflection): Expose ReflectionService #3708

Job	Run time
codegen	15s
check-external-types	33s
check (ubuntu-latest)	1m 54s
clippy	40s
check (macOS-latest)	1m 57s
cargo-deny check	24s
check (windows-latest)	4m 49s
Interop Tests (ubuntu-latest)	37s
Check MSRV	30s
Interop Tests (macOS-latest)	44s
rustfmt	7s
Interop Tests (windows-latest)	2m 7s
semver	1m 16s
test (ubuntu-latest)	2m 36s
Check unused dependencies	4m 10s
test (macOS-latest)	2m 9s
test (windows-latest)	5m 22s
	30m 10s

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