Clean up moduleId, add ability to specify ignore via file path with extension

[jamescdavis]

As described in #2128, when ignore is configured, moduleId is still required when calling the node API's verify() despite the docs making no mention of this. This remedies that by cleaning up usage of moduleId internally as proposed in #2128.

There is at least one user of the node API that this is affecting: mansona/lint-to-the-future-ember-template#12

The one place I've left any reference to moduleId is within lib/-private/module-status-cache because configuration of ignore for specific files (non-glob) currently requires specification as a module instead of a file path with extension, e.g.

// .template-lintrc.js
module.exports = {
  ignore: ['path/to/template'],
};

I have, though, added the ability to also specify specific files via path with extension, e.g.

// .template-lintrc.js
module.exports = {
  ignore: ['path/to/template.hbs'],
};

and updated the docs to use this instead of by module.

This was motivated in part with wanting to have consistency with overrides (see #2513).

We may want to deprecate specifying by module and remove in next major version.

[jamescdavis]

This is out of scope for this PR, but should we update this example

ember-template-lint/docs/ignore.md

Lines 16 to 21 in ba97a87

	ignore: [
	'project-name/templates/login',
	'project-name/templates/components/odd-ones/**',
	'app/templates/login',
	'app/templates/components/odd-ones/**',
	]

to no longer duplicate ignores and remove

ember-template-lint/docs/ignore.md

Lines 25 to 33 in ba97a87

	## Why patterns are duplicated
	You may have noticed in the sample configuration that the four patterns are actually two patterns repeated with different prefixes.
	This is because `ember-template-lint` works directly with the filesystem and is not aware
	of the applications module prefix, however `ember-cli-template-lint` works within the build
	pipeline of your application which is not aware of the original file paths since all modules
	are within your applications module prefix by the time it is ran.
	**_tldr;_** The `app/...` patterns match the filesystem (app directory). The `project-name/...` patterns match Ember's resolver (`ENV.modulePrefix` in `config/environment.js`).

now that ember-cli-template-lint is deprecated?

[jamescdavis]

Also

ember-template-lint/docs/ignore.md

Line 35 in ba97a87

After [Module Unification](https://github.com/emberjs/ember.js/issues/16373), Ember's internal resolver will match the filesystem, so ignore patterns will no longer need to be repeated.

should probably be removed at this point, regardless.

[bmish]

@jamescdavis very sorry about the delay on this. A few questions:

1. Can you rebase this on the latest master?
2. Can you explain in a bit more detail if this is an internal-only change, a bug fix, a feature, or a breaking change?
3. Is this ready to merge?