Add rule documentation URLs and schemas (and eslint-plugin-eslint-plugin) #294
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eslint-plugin-eslint-plugin is a popular plugin for enforcing best practices for eslint plugins.
The main reason I added this is because I noticed that the mocha rules did not have URLs specified. URLs are necessary so that IDEs/editors can provide a convenient link to rule documentation when showing violations so that developers can better understand the rules. So I enabled the fully-autofixable rule eslint-plugin/require-meta-docs-url.
A few other violations were autofixed including duplicate test cases, the use of the deprecated report API, and adding missing empty schemas.