At present, we support a flavor of JSON-RPC as one of the primary ways of integrating with a running Tendermint node.

From discussions with users (e.g. @hdevalence), it's clear there's a need for a full gRPC interface to Tendermint. This would dramatically simplify client generation for interaction with Tendermint, and would help get around Tendermint's very odd JSON serialization quirks.

There's some context provided by ADR-057, but no clear decision was documented in that ADR. Previously, the team had decided to deprecate and remove gRPC support (see #7121 and #9683), but that decision has now been reversed.

Definition of Done

When Tendermint provides a full gRPC interface that mirrors the functionality provided by the current RPC.