New rule: no-throws-string

[platinumazure]

assert.throws has removed (block, string, string) signature in QUnit 2.0. Need a new rule to catch this and add to qunit/two configuration.

Probably worth adding to qunit/recommended configuration, since (block, regex, string) is more flexible anyway.

No need to flag (block, string) form as that has always been interpreted as an assertion message rather than an expected string, so its behavior is unchanged.

Marked as "breaking" since changes to shared configurations are very likely to be breaking changes.

[platinumazure]

Removing "breaking" label because I can create a separate issue to merge into the shared configs later (only the shared config changes are breaking).