bindings: Narrow `uniffi` interface #460

Job	Run time
plan	6s
upload-local-artifacts (aarch64-apple-darwin, macos-11, curl --proto '=https' --tlsv1.2 -LsSf htt...	6m 55s
upload-local-artifacts (x86_64-apple-darwin, macos-11, curl --proto '=https' --tlsv1.2 -LsSf http...	7m 56s
upload-local-artifacts (x86_64-unknown-linux-gnu, ubuntu-20.04, curl --proto '=https' --tlsv1.2 -...	4m 4s
should-publish	0s
publish-release	0s
	19m 1s

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