Feature/colon to emoji toggle

[jatinfoujdar]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the xcodebuild and swiftlint --strict commands

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Description

This PR adds a new "Colon to emoji entry" toggle to the keyboard settings. When enabled, users can type a colon (:) followed by a keyword to get emoji suggestions, similar to Slack or Discord. If the toggle is off, this feature is disabled.

Main changes:

• Added the "Colon to emoji entry" toggle to the keyboard functionality section in settings.
• Updated the settings UI and logic to save and load the toggle state.
• Modified the keyboard logic so colon-to-emoji suggestions only appear if the toggle is enabled.
• Updated related models and variables to support this feature.

Related issue

• Fixes Discussion: : to emoji entry command for Scribe keyboards #364

[github-actions]

Thank you for the pull request! 💙

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the CI unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[github-actions]

First PR Commit Check

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• The contributor's name and icon in remote commits should be the same as what appears in the PR
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