Revise report formats

[LPGhatguy]

We should revisit what reporting formats we have available.

Our current TextReporter and TextReporterQuiet don't have much configuration, since they existed prior to the introduction of the TestEZ CLI. We should be able to introduce a new configuration interface utilizing the CLI and a new top-level API (#66) for configuring reporting.

I think we should have at least these report formats:

• Text, with configurable verbosity
• JSON, for use with custom CI systems
• TeamCity. We might be able to drop this format as we switch to GitHub Actions.
• A standard format, like TAP?

[amoss-roblox]

We should have a summarised text reporter like https://github.com/sunfit/jest-summary-reporter