Add instructions on publishing a new SDK version.

Author: ro-tex

PUBLISH.md

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+# Instructions for publishing a new SDK version
+
+## Go
+
+1. Tag a `main` commit with `go/vX.Y.X`. This is enough for the new version to be considered released.
+2. Additionally, we can create a new release directly on GitHub. make sure to choose the correct tag, target, and
+   previous version/tag. That allows you to use the `Generate release notes` button to get a good starting point of the
+   release notes.
+
+## TypeScript
+
+1. Increment the version in `package.json` to what it should be.
+2. Run `npm i` in order to update `package-lock.json`.
+3. Trigger the `Manual NPM Publish for TS SDK` GitHub action.
+
+## Rust
+
+1. Increment the version in all `Cargo.toml` files.
+2. Run `cargo build` and `cargo publish --dry-run` in order to update `Cargo.lock`.
+3. Run the `Publish Chainlink Data Streams SDK Crate` and `Publish Chainlink Data Streams Report Crate` GitHub actions.