chore(tests): Reduce futures crates (#1448)

tonic-build: option to emit `Arc<Self>` as server receiver (#1352)

This implements an option to emit `Arc<Self>` instead of `&self` in
server traits. This enables implementor to reference `Self` dat

tonic-build: option to emit `Arc<Self>` as server receiver (#1352)

This implements an option to emit `Arc<Self>` instead of `&self` in
server traits. This enables implementor to reference `Self` data for
indefinite duration, which may be useful for streaming requests.

Fixes: #1351

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