Mail-deduplicate

> \[!IMPORTANT\]
> This version is not released yet and is under active development.

- Slim down package by moving unit tests out of the main package.
- Split `dev` dependency groups into optional `test`, `typing` and `docs` groups.
- Remove direct dependency on `mypy`.
- Run tests on Python `3.13-dev` on all platforms but `macos`.
- Run tests on `macos-14`. Drop tests on `macos-12`.
- Build `arm64` binaries on `macos-14`.

- Drop support of Python 3.7.
- Reduce memory usage. Addresses {issue}`362`.
- Replace unmaintained `bump2version` by `bump-my-version`.
- Test `mdedup` binaries.
- Run tests and actions on released Python 3.12 version.
- Run tests on macos-13. Remove tests on macos-11.

- Reverts distribution of package via trusted channel.

- Redo release to fix trusted publisher on PyPi.

- Produce dependency graph in Mermaid instead of Graphviz. Add new dev dependency on `sphinxcontrib-mermaid`.
- Move all documentation assets to `assets` subfolder.
- Distribute package on PyPi via a trusted publisher channel.