feat: add content_format param to ConfluenceLoader.load() (#5922)
Confluence API supports difference format of page content. The storage
format is the raw XML representation for storage. The view format is the
HTML representation for viewing with macros rendered as though it is
viewed by users.
Add the `content_format` parameter to `ConfluenceLoader.load()` to
specify the content format, this is
set to `ContentFormat.STORAGE` by default.
#### Who can review?
Tag maintainers/contributors who might be interested: @eyurtsev
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Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>