util/logging.ts: Add support for logging

[findgriffin]

util/logging.ts: Add LogHandler interface, LogLevel enum, and ConsoleLogHandler.

Description

Add a log handler interface and implementation.

Motivation and context

Following a LSE where we couldn't get reliable information from the customer side, we decided to add a logging facility to all of the drivers.

I spent a few hours surveying log library options in JavaScript/TypeScript. The conclusion that I came to is that they are either bulkier than what we need (log4js-node) or so simple that it's not worth us taking a dependency (pino), hence the strategy I adopted in this PR.

TODO: This PR does not yet actually call our log function from the request/response path, I thought the tests were failing on Monday. They appear to pass in GitHub Actions, so maybe that's a "fails on my machine" type of thing.

How was the change tested?

Unit tests?

Screenshots (if appropriate):

Change types

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

Checklist:

• • [x] 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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[ptpaterson]

We should put together some tests that demonstrate using logger stuff. But I've updated the things I have opinions and commented about.