Ensure trigger sentences do not contain punctuation

[synesthesiam]

Breaking change

Proposed change

This PR adds validation to the sentence trigger to ensure that punctuation is not present. A soft warning in the frontend is also being worked on: home-assistant/frontend#17119

Every character in a sentence template must match unless it's marked optional. hassil automatically strips punctuation from the input text during matching, so the templates should not require it.

Note that this can lead to some non-intuitive templates: for example, matching the phrases "It's 4 a.m." or "It's 4am". Whisper returns the text "It's 4:00 AM." for the spoken phrase, but the colon is considered punctuation! Periods are also punctuation (even in abbreviations), so the template it's 4[00][ ]am is needed to cover all of the cases.

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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (conversation) you are listed as a code owner for? Thanks!

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[frenck]

Shouldn't this PR go into the current beta release?

../Frenck

[synesthesiam]

Yes, it should 👍