rfctr: Implement Sharepoint V2 Source Connector (#3314)
### Description
Migrate over the sharepoint connector to v2 and in the process refactor
the majority of the connector. It now pulls in much more content from
the SDK on index time, including permissions data is the parameters are
passed in. HTML content generated from the SitePage is isolated to the
html content in the `CanvasContent1` and `LayoutWebpartsContent`
returned by the SDK.
Some TODOs were left in there for future iterations. Currently only
document and site page content is being pulled in from sharepoint, but
sharepoint has more types of content than just that, such as lists. Note
left in there to support other sharepoint types.
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Co-authored-by: ryannikolaidis <1208590+ryannikolaidis@users.noreply.github.com>
Co-authored-by: rbiseck3 <rbiseck3@users.noreply.github.com>
Co-authored-by: vangheem <vangheem@gmail.com>
Co-authored-by: Ahmet Melek <ahmetmeleq@gmail.com>
Co-authored-by: Ahmet Melek <39141206+ahmetmeleq@users.noreply.github.com>
