Rich Text Editor | Added HardBreak extension in editor for force line break (<br> tag)

[aagash-ni]

Pull Request

🤨 Rationale

Fix for Bug 2516897: Switching to a new line by pressing enter adds more spaces than expected.

• Pressing enter in the editor for a new line adds a Paragraph tag which has more space than expected between lines.
• Enabling HardBreak will allow the user to switch to a new line by pressing Shift/Ctrl/Cmd + Enter which will make minimal space between lines by adding <br> tag instead of Paragraph Tag.

👩‍💻 Implementation

• Added HardBreak node in Tiptap Editor.
• Enabled newline and escape rules in MarkdownIt for RichTextMarkdownParser to parse the HardBreak markdown syntax as per CommonMark Spec to <br> tag.
• Added hardBreak node to RichTextMarkdownSerializer to serialize the <br> tag to respective hard break markdown syntax.
• As we are using prosemirror-markdown, it serializes the <br> tag to backslash with line ending syntax as per the CommonMark Spec example 633.

In Windows Shift/Ctrl+ Enter and in Mac Cmd + Enter will switch to a new line (line break).

We are not exposing any format buttons to add line breaks (Hard Break), The only way to break the line is by using the Keys mentioned above.

🧪 Testing

• Added unit tests and visual tests for the functionality.
• Manually tested and verified the functionality of the supported features in Storybook build.

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[m-akinc]

As a reminder, please create the PR in draft mode and let a buddy (me) review before publishing and adding owners.

[atmgrifter00]

You can bypass me for this review.

[rajsite]

Waiting to see results of test changes

[aagash-ni]

Waiting to see results of test changes

Hi @rajsite , I hope you are waiting for Mert's test change comments to be addressed, please let us know if you have any other concerns. I have addressed all the comments that Mert mentioned.

[rajsite]

Can bypass @mollykreis and @atmgrifter00, so ready to merge!