[Mentions Plugin]: add triggerPreviousCharPattern option

[cacosandon]

Description

See changesets.

Before this PR, if you wanted to create a mention, it had to be either at the beginning of the line or after a space. The option triggerPreviousCharPattern allows users to create mentions after custom characters.

For instance, if you want to create a tag between parenthesis, or between quotes.

Using:

createMentionPlugin({
  enabled: !!enabled.mention,
  options: {
    triggerPreviousCharPattern: /^$|^[\s"']$/,
  },
}),

Screen.Recording.2023-07-27.at.09.48.33.mov

[changeset-bot]

🦋 Changeset detected

Latest commit: c6f5967

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@udecode/plate-mention	Minor
@udecode/plate	Minor

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Click here if you're a maintainer who wants to add another changeset to this PR

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Name	Status	Preview	Comments	Updated (UTC)
plate	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 27, 2023 2:09pm

[reviewpad]

AI-Generated Summary: This pull request includes two patches related to improvements to the mention functionality in a text editor package. The first patch introduces a new triggerPreviousCharPattern parameter in the mention feature. This pattern is applied to the character previous to the mention trigger. This allows for more complex triggering conditions for mentions, such as triggering only after certain characters. The change is reflected in the documentation, test files, and type definitions. The second patch adds a changeset reflecting the update. This update is considered a minor change according to the changeset. Overall, this pull request enhances the flexibility of the mention feature in the text editor package.

[reviewpad]

Thank you @cacosandon for this first contribution!

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[cacosandon]

Updated the PR description and video example. You can test in the Vercel deployment that you can tag after quotes (" or '), spaces and beginning of line.