Adds CLI entrypoint

[Bing-su]

Adds a command-line interface (CLI) entrypoint for easier interaction with the application.

Issue

❯ uvx trustme --help
Installed 5 packages in 171ms
Package `trustme` does not provide any executables. 

[A5rocks]

Thanks, this makes sense to me.

[pquentin]

Thanks! LGTM.

[trio-bot]

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