ci: Improved changelog formatting and brew setup

[DylanDevelops]

Pull Request Checklist

• I have read and followed the contribution guidelines.
• My pull request targets the main branch of tmpo.
• I have tested these changes locally on my machine.

Description

This pull request updates the release workflow and packaging configuration to automate changelog generation, improve shell completion distribution, and streamline Homebrew packaging. The main themes are automating release notes, enhancing shell completion support, and updating packaging for consistency and maintainability.

Release automation and changelog generation:

• Added a step to the GitHub Actions release workflow to generate release notes using git-cliff, and configured GoReleaser to use the generated notes during release creation. (.github/workflows/release.yml, cliff.toml) [1] [2]
• Removed the old changelog section from .goreleaser.yml in favor of using git-cliff for changelog formatting and grouping.

Shell completion improvements:

• Added build hooks to generate bash, zsh, and fish shell completion scripts before packaging, and included these scripts in both Windows and Unix archives. (.goreleaser.yml) [1] [2]
• Updated the Homebrew packaging configuration to explicitly specify the generated shell completion files for each supported shell.

Packaging and configuration updates:

• Changed archive configuration keys from builds/format to ids/formats for consistency with GoReleaser's latest schema.
• Migrated from the deprecated brews key to homebrew_casks in .goreleaser.yml for Homebrew packaging.