Rule: `default-export-matches-file`

[brandongregoryscott]

Inspired by these eslint-plugin-import rules:

import/no-named-as-default import/no-anonymous-default-export

Implement a rule that ensures default exports match their filename (in some sort of casing, we can add additional configuration options for specific casing later - default should probably be camelCase)

// noop.ts
export default function foo() {};

would be transformed to:

// noop.ts
export default function noop() {};