Add changeset for using RpcRequest and RpcResponse in RPC Subscriptio…

…ns (#3407)

This PR adds a changeset combining several smaller changes in the previous PRs of this stack. That way, we provide a slightly more digest changelog.

.changeset/cool-bears-taste.md

@@ -0,0 +1,22 @@
+---
+'@solana/rpc-subscriptions-spec': patch
+'@solana/rpc-subscriptions-api': patch
+'@solana/rpc-transport-http': patch
+'@solana/rpc-subscriptions': patch
+'@solana/rpc-transformers': patch
+'@solana/rpc-spec-types': patch
+'@solana/rpc-spec': patch
+'@solana/web3.js': patch
+'@solana/rpc': patch
+---
+
+Use `RpcRequest`, `RpcResponse` and their transformers in RPC Subscriptions packages
+
+This change makes the RPC and RPC Subscriptions architecture more consistent by using the same `RpcRequest` and `RpcResponse` types and transformers as the basis for handling user requests (RPC calls or subscriptions) and returning responses to them.
+
+See the following PRs for more details:
+- [PR #3393](https://github.com/solana-labs/solana-web3.js/pull/3393)
+- [PR #3394](https://github.com/solana-labs/solana-web3.js/pull/3394)
+- [PR #3403](https://github.com/solana-labs/solana-web3.js/pull/3403)
+- [PR #3404](https://github.com/solana-labs/solana-web3.js/pull/3404)
+- [PR #3405](https://github.com/solana-labs/solana-web3.js/pull/3405)