docs: release notes template (#1064)

* add release notes template

* add upgrading info

* add gh action to push proto files to buf.build

---------

Co-authored-by: MSalopek <[email protected]>
Co-authored-by: Shawn <[email protected]>

.github/workflows/proto-registry.yml

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+name: Buf-Push
+# Protobuf runs buf (https://buf.build/) push updated proto files to https://buf.build/cosmos/interchain-security
+# This workflow is only run when a .proto file has been changed
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "proto/**"
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: bufbuild/[email protected]
+      - uses: bufbuild/buf-push-action@v1
+        with:
+          input: "proto"
+          buf_token: ${{ secrets.BUF_TOKEN }}

RELEASE_NOTES.md

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+<!--
+  A release notes template that should be adapted for every release
+    - release: <v*.*.*>
+    - release branch: <v*.*.x>
+    - the last release: <v-last> 
+    - the last release branch: <v-last.x>
+-->
+
+# Replicated Security <v*.*.*>  Release Notes 
+
+## 📝 Changelog
+
+Check out the [changelog](https://github.com/cosmos/interchain-security/blob/<v*.*.*>/CHANGELOG.md) for a list of relevant changes or [compare all changes](https://github.com/cosmos/interchain-security/compare/release/<v-last>...<v*.*.*>) from last release.
+
+<!-- Add the following line for major releases -->
+Refer to the [upgrading guide](https://github.com/cosmos/interchain-security/blob/release/<v*.x>/UPGRADING.md) when migrating from `<v-last.x>` to `<v*.x>`.
+
+## 🚀 Highlights
+
+<!-- Add any highlights of this release -->
+
+## ❤️ Contributors
+
+* Informal Systems ([@informalinc](https://twitter.com/informalinc))
+
+This list is non-exhaustive and ordered alphabetically.  
+Thank you to everyone who contributed to this release!

UPGRADING.md

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+# Upgrading Replicated Security
+
+This guide provides instructions for upgrading to specific versions of Replicated Security.
+
+## [v3.0.x](https://github.com/cosmos/interchain-security/releases/tag/v3.0.0-rc0)
+
+### Upgrading to Cosmos SDK 0.47
+
+The following should be considered as complementary to [Cosmos SDK v0.47 UPGRADING.md](https://github.com/cosmos/cosmos-sdk/blob/v0.47.0-rc2/UPGRADING.md).
+
+#### Protobuf 
+
+Protobuf code generation, linting and formatting have been updated to leverage the `ghcr.io/cosmos/proto-builder:0.11.5` docker container. Replicated Security protobuf definitions are now packaged and published to [buf.build/cosmos/interchain-security](buf.build/cosmos/interchain-security) via CI workflows. The `third_party/proto` directory has been removed in favour of dependency management using [buf.build](https://docs.buf.build/introduction).
+
+#### App modules
+
+Legacy APIs of the `AppModule` interface have been removed from ccv modules. For example, for 
+
+```diff
+- // Route implements the AppModule interface
+- func (am AppModule) Route() sdk.Route {
+-     return sdk.Route{}
+- }
+-
+- // QuerierRoute implements the AppModule interface
+- func (AppModule) QuerierRoute() string {
+-     return types.QuerierRoute
+- }
+-
+- // LegacyQuerierHandler implements the AppModule interface
+- func (am AppModule) LegacyQuerierHandler(*codec.LegacyAmino) sdk.Querier {
+-     return nil
+- }
+-
+- // ProposalContents doesn't return any content functions for governance proposals.
+- func (AppModule) ProposalContents(_ module.SimulationState) []simtypes.WeightedProposalContent {
+-     return nil
+- }
+```
+
+#### Imports
+
+Imports for ics23 have been updated as the repository have been migrated from confio to cosmos.
+
+```diff
+import (
+    // ...
+-   ics23 "github.com/confio/ics23/go"
++   ics23 "github.com/cosmos/ics23/go"
+    // ...
+)
+```
+
+Imports for gogoproto have been updated.
+
+```diff
+import (
+    // ...
+-   "github.com/gogo/protobuf/proto"
++   "github.com/cosmos/gogoproto/proto"
+    // ...
+)
+```
+
+## [v2.0.x](https://github.com/cosmos/interchain-security/releases/tag/v2.0.0)
+
+### Provider 
+
+Upgrading a provider from `v1.1.0-multiden` to `v2.0.0` will require state migrations. See [migration.go](./x/ccv/provider/keeper/migration.go). See the provider module's `ConsensusVersion` in [module](./x/ccv/provider/module.go).
+
+### Consumer
+
+Upgrading a consumer from `v1.2.0-multiden` to `v2.0.0` will NOT require state migrations. See the consumer module's `ConsensusVersion` in [module](./x/ccv/consumer/module.go).