[tui][edi] editor component MD parser problem with block quotes

[nazmulidris]

While looking at this issue, also explore

1. the idea of using tree sitter instead of a custom MD parser, and
2. a document based parser (like cmark) and customize that, to see if it is easier to create a reliable parser.
3. this MD viewer is built using a PEG based parser (pest): https://github.com/henriklovhaug/md-tui/tree/main/src. PTAL for inspiration.

Use the debugger to fix this issue.

When a pre-existing code block exists, and an inline code item is added, then there are issues. The video recording demonstrates this.

293400516-ac27de22-ed6f-4396-aa1d-75a35a78e223.mp4

Here's the code:

https://github.com/r3bl-org/r3bl-open-core/blob/nazmulidris/edi-file-save-action/tui/src/tui/md_parser/parser.rs#L39

There are other bugs in the MD parser that should be fixed as well by exhaustively testing and fixing the parser. And updating the test suite.