Add AirbyteServer block

[zzstoatzz]

Adds the AirbyteServer block to handle nginx authentication for OSS instance in AirbyteClient and store config info about the instance running airbyte.

This PR alters the tasks in this collection to accept an AirbyteServer instead of the individual fields, so these are breaking changes.

This PR also adds a deprecation warning to export_configuration, as the underlying API endpoint was removed from OSS airbyte as of airbyte v0.40.7

Closes #39
Closes #21

Example

Checklist

• This pull request includes tests or only affects documentation.
• Summarized PR's changes in CHANGELOG.md

[ahuang11]

Before I forget, I think we should add a changelog with the usual items and also highlight breaking changes in the first line.

[ahuang11]

Looks good! Mostly questions

[ahuang11]

Thanks for making the changes!

[desertaxle]

We're close enough to not making any breaking changes that I propose we don't make any. We can deprecate, continue with 0.1.x version releases, and then remove them in 0.2.0 when we've gotten this collection to our short term target state.

[desertaxle]

🚢 it!

Requested changes addressed