Add script to generate proto-docs (#8238)

* init protobuf-docs

* update template

* update docs/core/README.md

* update proto files

* update template

Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>

docs/core/README.md

@@ -19,6 +19,7 @@ This repository contains reference documentation on the core concepts of the Cos
 9. [Telemetry](./telemetry.md)
 10. [Object-Capabilities](./ocap.md)
 11. [RunTx recovery middleware](./runtx_middleware.md)
+12. [Protobuf documentation](./proto-docs.md)
 
 After reading about the core concepts, check the [IBC documentation](../ibc/README.md) to learn more
 about the IBC core concepts and how to integrate it to you application.

docs/core/grpc_rest.md

@@ -37,7 +37,7 @@ The `grpc.Server` is a concrete gRPC server, which spawns and serves any gRPC re
 
 Once the gRPC server is started, you can send requests to it using a gRPC client. Some examples are given in our [Interact with the Node](../run-node/interact-node.md#using-grpc) tutorial.
 
-An overview of all available gRPC endpoints shipped with the Cosmos SDK is [coming soon](https://github.com/cosmos/cosmos-sdk/issues/7786).
+An overview of all available gRPC endpoints shipped with the Cosmos SDK is [Protobuf documention](./proto-docs.md).
 
 ## REST Server