[Feature] openbb-sec: Custom HTML2Markdown Conversion

[deeleeramone]

This PR refactors the sec provider to use a custom HTML -> Markdown converter instead of relying on multiple libraries as strategies and cleaning up after them.

It removes dependencies:

• inscriptis
• trafilatura

The new module, openbb_sec.utils.html2markdown.html_to_markdown, is geared specifically for SEC HTML content. It has a much higher success rate - especially where table extraction is concerned - and handles a number of scenarios and filing formats. The existing, obb.equity.fundamental.management_discussion_analysis(), is also better equipped to handle more scenarios:

• Section is in a different part of the same document, or is attached as an exhibit.
• Content is heavily nested.
• 2X column wide-page layouts.
• Embedded images.

You can A/B this against the existing (use include_tables=True) with symbols such as:

• DE
• MSFT
• IBM
• JPM
• GS
• MS
• WMT
• NKE
• NDAQ
• CRM
• XOM
• CVX
• BRK-A

[piiq]

To make this readable/understandable by both humans and AI I suggest we split the huge converter function apart. I understand the complexity of what it's doing, but having that function be that large is a risk it won't be understood or read correctly by any party reading it

[deeleeramone]

@piiq, html_to_markdown and convert_table have been reduced to under 1000 lines each. Most of the recursive inner functions have been updated to use module-level functions that pass the necessarily values into the enclosure.