Create release.yml file for automatic release notes generation

[EwoutH]

Adds a configuration file .github/release.yml that lets GitHub automatically draft release notes based on the labels attached to PRs that will be included in that release. These drafted release notes can form a consistent basis for our changelog and manually expanded with context for certain PRs if needed.

The currently proposed labels are experimental, breaking, feature, enhancement, bug, docs, ci, testing, dependency, maintenance and packaging. The last five are grouped in the changelog under Maintenance 🔧.

For this to work nicely, it's important that all merged PRs have one of these labels attached to them and that the PR titles are sufficiently descriptive.

• See Automatically generated release notes.
• Examples of how this look can be found at the mesa repository releases.
• This configuration is identical to the one at the main Mesa repo. See https://github.com/projectmesa/mesa/pull/1925.

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```diff @@ Coverage Diff @@ ## main #95 +/- ## ======================================= Coverage ? 91.19% ======================================= Files ? 14 Lines ? 2193 Branches ? 0 ======================================= Hits ? 2000 Misses ? 193 Partials ? 0 ```

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[adamamer20]

Wonderful, I wanted to add that! Thanks @EwoutH!

[adamamer20]

@EwoutH Can a PR have 2 different labels (eg. docs and bugs)?

[EwoutH]

Yes, but the top one takes precedence. For example, breaking is currently at the top, so it takes precedence over all other labels.

So you can reorder them if you like another priority.