Remove uniffi boilerplate (#341) #686

Job	Run time
Build x86_64-unknown-linux-gnu target	4m 20s
Build aarch64-apple-darwin target	3m 31s
Build x86_64-apple-darwin target	6m 36s
Build x86_64-pc-windows-msvc target	10m 11s
Build x86_64-unknown-linux-musl target	7m 32s
lint	2m 21s
msrv (ubuntu-latest, stable)	4m 29s
rust-test-vectors	4m 2s
test (ubuntu-latest)	2m 8s
test (macos-latest)	1m 43s
test (windows-latest)	8m 23s
kotlin-acceptance-testing (ubuntu-latest)	1m 11s
kotlin-acceptance-testing (macos-latest)	44s
kotlin-acceptance-testing (macos-12)	2m 26s
kotlin-acceptance-testing (windows-latest)	1m 32s
kotlin-deploy-snapshot	2m 4s
	1h 3m 13s

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