Revert backwards incompatible changes to HTTPClient interface

[ptpaterson]

Description

This PR removed backwards-incompatible changes introduced in v2.4.0: remove the getURL() method from the HTTPClient interface.

Full (and accurate!) endpoints are not available at the point of logging for feeds and streams, so I updated the debug message to be the request path instead of full URL.

Bonus:

• Added a debug line to starting stream connection for consistency with query and feed.
• tidied up imports

Motivation and context

In #308, published in v2.4.0, we added some basic logging infrastructure, but that made breaking changes to the HTTPClient API. In retrospect, I don't believe those were helpful changes either - The getURL() implementations added to the built-in clients do not change with the request path, so using getURL when you want to gather information for a stream request, for example, it would return the incorrect URL.

How was the change tested?

No changes to testing.

Screenshots (if appropriate):

Change types

• • Bug fix (non-breaking change that fixes an issue)
• • New feature (non-breaking change that adds functionality)
• • Breaking change (backwards-incompatible fix or feature)

Checklist:

• • My code follows the code style of this project.
• • My change requires a change to Fauna documentation.
• • My change requires a change to the README, and I have updated it accordingly.

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