### What problem does this PR solve?

Fix context loss caused by separating markdown tables from original
text. #6871, #8804.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Enhance the recognition of both borderless and bordered Markdown tables.
Add support for extracting HTML tables, including various scenarios with
nested HTML tags. Improve performance by using conditional checks to
reduce unnecessary regular expression matching.

### What problem does this PR solve?

Optimize the table extraction logic in the Markdown parser:
Enhance the recognition of both borderless and bordered Markdown tables.
Add support for extracting HTML tables, including various scenarios with
nested HTML tags.
Improve performance by using conditional checks to reduce unnecessary
regular expression matching.

### Type of change

- [x] Performance Improvement

Co-authored-by: wenju.li <wenju.li@deepctr.cn>

### What problem does this PR solve?

Add license statement.

### Type of change

- [x] Refactoring

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

### What problem does this PR solve?

Support extracting table for markdown file in general parser

### Type of change

- [x] New Feature (non-breaking change which adds functionality)