Use Body types of http-body

[aeryz]

Feature Request

Crates

tonic

Motivation

Tonic uses its own Body implementations BoxBody, MapBody and EmptyBody. This RFC suggests to add BoxBody, EmptyBody and several others to Hyper. But it seems like they will be added to http-body. There is already a PR opened. After this PR gets merged, and other Body types are implemented, I think tonic should re-export them instead of re-implementing them.

Proposal

Body types from http-body should be re-exported.