Add settings to enable support for mocha.parallel

[stefanbuck]

This PR adds a new shared settings value which accepts an array of additional suite names, for example:

"settings": { "mocha/additionalSuiteNames': [ 'foo', 'bar' ], }

This is useful when working with modules like mocha.parallel

@lo1tuma let me know what you think and I'll adapt it for the following rules as well.

• no-top-level-hooks
• max-top-level-suites
• no-hooks-for-single-case
• no-identical-title
• no-nested-tests
• no-sibling-hooks

[lo1tuma]

Thanks for the PR.

Actually I was thinking about a more generic approach. I would prefer a setting which accepts an array of additional suite names, for example:

"settings": { "mocha/additionalSuiteNames": [ "parallel", "xparallel", "myOtherMochaExtensionCustomSuiteName" ] } }

This way we would be agnostic to any specific mocha extension and we don’t have to add a separate setting for each custom suite name. What do you think?

[stefanbuck]

Yeah, make sense. I've updated the PR as you suggested. Let me know if it's okay for you and I'll tweak the other rules as well.

[lo1tuma]

Nice work 👍, LGTM.

[stefanbuck]

@lo1tuma please have another look. I'm undecided if the valid test cases really make sense, since the suite names is optional.

[lo1tuma]

@stefanbuck I think those tests make sense, if someone breaks the feature of addtionalSuteNames those tests would fail.