Assert class to type hinted closure

[peterfox]

Changes

• Adds AssertWithClassStringToTypeHintedClosureRector rule.
• Adds a FacadeAssertionAnalyzer class.
• Adds tests for the rule.
• Updates the docs.

Why

Helps remove a redundant argument to the use of assertDispatched.

-Bus::assertDispatched(OrderCreated::class, function ($job) {
+Bus::assertDispatched(function (OrderCreated $job) {
     return true;
 });

Notes

This can probably be expanded further but I've left it as just Event and Bus assertDispatch calls.