Add support for inline math equation and block math equation

[magic3007]

Now Notion has supported the inline math equation and the block math equation. Is it possible to add support for inline markdown math equation like $x=x+1$ and block math equation like $$ E=mc^2 $$

[wongsingfo]

mistletoe supports parsing math equation and notion-py seems to provide the equation block. It should be easy to add this feature (x

FYI: https://github.com/miyuchina/mistletoe/blob/8f2f0161b2af92f8dd25a0a55cb7d437a67938bc/mistletoe/latex_token.py https://github.com/jamalex/notion-py/blob/b7041ade477c1f59edab1b6fc025326d406dd92a/notion/block.py#L568

[Cobertos]

I don't really want to add a bunch of non-standard Markdown extensions to the default library, but providing an API to add such extensions seems fine. It sounds like @wongsingfo might have already messed with this a bit

[wongsingfo]

I found that it appears to be hard to add the inlined equation (though adding equation block is quite simple). The bottleneck is that the notion-py library does not provide a way to convert markdown into notion api format or vice versa. Specifically, notion-py depends on commonmark, which is a "strongly defined and highly compatible specification of Markdown" and doesn't support equations. It seems that everyone tries to avoid non-standard markdown extensions when possible...

[storopoli]

Also looking forward for math support! 🤗

[Cobertos]

Bumped the version and merged @EgorDm 's PR. The upstream PR is in as well.