Change matcher format() to description()

[minkimcello]

Motivation

Currently if someone wants to construct their own matcher, they have to pass in an object that looks like this:

{
  match(): { /* ... */ },
  format(): { /* ... */ }
}

But with this new refactor, we're renaming format to description:

{
  match(): { /* ... */ },
  description(): { /* ... */ }
}

This will resolve #906.

Approach

• Instead of changing formatMatcher to descriptionMatcher, I flipped it to say matcherDescription as that seems more descriptive in my opinion.
• Added changeset for minor bump since we're still on v0.
• Removed tests for built-in matchers that called matcher().description() as that's not something a user would be invoking themselves.
• Added test for the matching matcher with the old format API to ensure it still works (but will output a deprecation message in the console).
• Updated documentation.

TODOs

• I should probably keep format() in to output a message to say it's deprecated...? Did.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9e4d8b2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@bigtest/interactor	Minor
bigtest	Patch

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[github-actions]

A preview package of this pull request has been published with the tag mk_matcher-format-rename.
You can try it out by running the following command:

$ npm install @bigtest/interactor@mk_matcher-format-rename

or by updating your package.json to:

{
  "@bigtest/interactor": "mk_matcher-format-rename"
}

Generated by 🚫 dangerJS against 9e4d8b2

[cowboyd]

LGTM 👍🏻