Implement AVA 3.2 protocol

[novemberborn]

Add support for the ava-3.2 provider protocol. See avajs/typescript#11 for an active implementation.

I think we can implement a placeholder here instead:

• ignoreChange should always return false
• resolveTestFile should return the testFile as-is
• updateGlobs should return both patterns as-is

[novemberborn]

This will be required for compatibility with AVA 4.