explicit-length-check: Check more cases

[fisker]

This rule should work in any cases return a boolean, add missing

• while (foo.length){}
• do {} while (foo.length);
• if (; foo.length;){}

I'll send more if I figure something else, this is actually preparing for #887

---

Coming changes in my mind:

• !foo.length should check in any place, I'll fix in another PR.
• LogicExpression not in if should check too.

[fisker]

Merging this, so I can continue work on it, let me know if you found something wrong