Add agile support

[henriblancke]

Add agile support

Support retrieving data from the Jira Cloud Software API discussed in #51 . This includes support for:

• Boards
• Sprints
• Epics
• Board Issues
• Board Projects

Additional changes

• Support to rename custom issue columns during issue retrieval. All customfield_xx fields should now be renamed to their actual field name.
• Metrics to count records retrieved during paginated requests
• Upgraded to singer-python==5.9.0

Manual QA steps

• I wasn't able to run non-unit tests, I'd love to learn how to run those.

Risks

• Some structural changes. They will allow easy adoption of JIRA API changes.

Rollback steps

• revert this branch

[cmerrick]

Hi @henriblancke, thanks for your contribution!

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[cmerrick]

You did it @henriblancke!

Thank you for signing the Singer Contribution License Agreement.

[ethanjdiamond]

Hi @henriblancke, thanks so much for doing the work to add this functionality, it's going to be amazingly helpful! I have a member of my team that's ready to start using this once you finish it. I was wondering how far along you felt you were on it? Is it worth waiting until it's ready, or should I start a different project in the meantime?

Thank you so much!
-Ethan

[henriblancke]

@ethanjdiamond thanks! I'm glad these changes look helpful to you 😄. It should be ready to go. We're already using these changes in production. You can always try to clone this branch and publish it to pypi under a different name (company-tap-jira) or to your companies private repository? If you need any help or have any feedback, feel free to reach out!

[ethanjdiamond]

If you need any help or have any feedback, feel free to reach out!

Will do! Thanks! Do you know if @cmerrick is still active on this and will merge it? It looks like core singer hasn't been touched since January and this repo hasn't been touched since Feb.

[saianil58]

Do we have any update on this PR