feat: Adds backend support for rendering tables in articles

[iamsivin]

Pull Request Template

Description

This PR will add backend support to render a table on the article page.

Fixes https://linear.app/chatwoot/issue/CW-3292/table-feature-in-help-center

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Screenshot
Before

After

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[linear]

CW-3292 Table feature in help center

[sojan-official]

• verified in local by creating an article directly in db

This is a **bold** text and *italic* text.

| Header1      | Header2      |
| ------------ | ------------ |
| **Bold Cell**| *Italic Cell*|
| Cell3        | Cell4        |

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.