Add character casing to TextBox control

[Authfix]

What does the pull request do?

Add character casing to TextBox

What is the current behavior?

Currently, we cannot add a specific casing to the text from the TextBox

What is the updated/expected behavior with this PR?

We can add the property CharacterCasing to Upper, Lower or Normal to manage casing (by default, Normal).

How was the solution implemented (if it's not obvious)?

Add a property and try to follow conventions.

Checklist

• Added tests
• Update sample project
• Submit a PR to https://github.com/AvaloniaUI/avalonia-docs to add new property

Breaking changes

N/A

Obsoletions / Deprecations

N/A

Fixed issues

Fixes #11931

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@Authfix,

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You can test this PR using the following package version. 11.2.999-cibuild0051627-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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