Added ClickUp Connector (#1521)

* Added connector for clickup

* Fixed mypy issues

* Fallback to description if markdown is not available

* Added extra information in metadata, and support to index comments

* Fixes for fields parsing

* updated fetcher to errorHandlingFetcher

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Co-authored-by: hagen-danswer <hagen@danswer.ai>

web/public/Clickup.svg

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