v3 Allow for custom Quote Notes

[DavidMarquezF]

Operating System: Windows DocFX Version Used: v3

QuoteSectionNote extension is hardcoded:

private readonly List<string> _noteTypes = new() { "[!NOTE]", "[!TIP]", "[!WARNING]", "[!IMPORTANT]", "[!CAUTION]" };

It would be nice if the templates could provide these through the context (token.json I guess?). Then all the templates would have full control over these properties.

[KalleOlaviNiemitalo]

If implemented, this would allow a custom template to recognize [!TODO] https://github.com/dotnet/docfx/issues/6268.

[DavidMarquezF]

Another option would also be to be able to maintain the current tags but allow users to set the titles themselves. I believe this is how docusaurus does it

Maybe something like:

> [!TIP](This is the title)
> Content