Only https://, ftp:// and http:// links work

[Tarang]

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Describe the bug If markdown has some text with a link, but the link uses a different scheme to https://, ftp:// or http://, it wont do anything

Checklist

• [X] I can reproduce this issue with a vanilla SwiftUI project.
• [X] I can reproduce this issue using the main branch of this package.
• [X] This bug hasn't been addressed in an existing GitHub issue.

Steps to reproduce Explanation of how to reproduce the incorrect behavior. This could include an attached project, a link to code, or a Markdown-formatted text exhibiting the issue (sample with mailto below)

Sample text

Expected behavior The expected behaviour is that it opens the url

Version information

• MarkdownUI: latest master
• OS: 17.1
• Xcode: 15