feat: show math in plain text in library cards

[navinkarkera]

Description

Converts mathjax equations to unicode to be rendered as plain text in library card previews.

Useful information to include:

• Which edX user roles will this change impact? Common user roles are "Learner", "Course Author".

Screenshot:

Supporting information

• Math is not rendered in Library Card previews frontend-app-authoring#1508
• Private-ref: FAL-3990

Testing instructions

• Create some text or problem components with mathjax equations in the body. Make sure to add the equation within first few characters to see the preview in library card.
• Verify that the card shows a plain text preview using unicode.
• Examples of mathjax equations can be found in tests.

Notes

• unicodeit supports many latex tags but some of them are missing like \frac, \mathbf, \bf etc. which I have handled using replacements.
• Some tags like \begin{bmatrix}, \begin{cases} etc. cannot be displayed properly in plain text so they are rendered raw.
• If you come up with some equations which are not rendered properly please let me know.

[openedx-webhooks]

Thanks for the pull request, @navinkarkera!

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