Implement Markdown parsing in useHandlePastedText

[juliopavila]

Description

This PR addresses the request in issue #236. It involves modifying the useHandlePastedText method to handle Markdown formatted text.

Changes Implemented:

1. Added marked library to parse Markdown into HTML.
2. The method isMarkdown has been added to identify if the incoming pasted text is in Markdown format. It checks for common Markdown syntax characters such as "#", "*", "_", "~", "[", "]", "(", ")", "|", "`", ">", "-".
3. If the text is identified as Markdown, it is first converted to HTML using marked. The HTML is then parsed into Draft.js blocks using convertFromHTML. The resulting blocks replace the current selection in the editor.
4. If the text is not identified as Markdown, it's treated as plain text and the function behaves as it did originally - replacing the current selection with the plain text.

Here's a sample Markdown snippet for testing:

# Heading

This is a paragraph with **bold text**, _italic text_, text with a [link](https://www.example.com), and `inline code`.

1. This is the first item in an ordered list
2. This is the second item on the ordered list
   - This is the first item in a nested unordered list
   - This is the second item in the nested unordered list

> This is a quote

***
This is a divider line

```python
# This is a code block
print('Hello, world!')```

This Markdown text covers all the scenarios we are aiming to handle with this PR.

Test Record

Screen.Recording.2023-07-25.at.1.57.42.PM.mov

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Name	Status	Preview	Comments	Updated (UTC)
tabula	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 25, 2023 5:18pm

[cedricwaxwing]

Really nice! 🤩