feat(#898): add Jira api v2 support

[theBenForce]

Closes #898

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[sestinj]

@theBenForce This is great work! We prefer to take all PRs through the preview branch so that they have a chance to be tested in the pre-release extension before going fully live. Would you be able to make this PR against the preview branch instead? This is also important because I made a small handful of changes to your original PR (mostly with regards to the importing of the adf-to-md library

[sestinj]

@theBenForce Thank you! Assuming it's mostly ready, would you like me to handle the few merge conflicts? Happy to do so

[theBenForce]

I haven't had a chance to test it yet, I wanted to make sure I didn't break anything before it got merged.

[theBenForce]

I just verified that my updates work with both the v2 and v3 API.

[theBenForce]

Should be ready for review @sestinj, I've verified it works with v2 and v3 APIs. Let me know if I need to update anything else.

[sestinj]

@theBenForce accidentally merged before asking this, but is there anything else that needs to be added to the documentation? Using my same config from before gives a 404

[theBenForce]

@sestinj you'll have to set apiVersion to "2" since you're not on API v3.