uber / NullAway / #1062
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JSpecify: initial checks for generic type compatibility at assignments (#715)

This pull request adds the identical type parameter nullability checks for both sides of an assignment. 
for example
`NullableTypeParam<@Nullable String> nullableTypeParam = new NullableTypeParam<String>();` should generate an error as the type parameters of both sides of the assignment do not have the same Nullability annotations.
This PR covers the following cases:
- checks for the variable instantiation `A<String> a = new A<@Nullable String>();`
- checks for the assignments
`A<@Nullable String> t1 = new A<@Nullable String>();
A<String> t2;
t2 = t1;`
- LHS and RHS with the exact same types
`A<String> a = new A<@Nullable String>();`
- RHS being a subtype of LHS
```java
class Test {
  class D<P extends @Nullable Object> {}
  class B<P extends @Nullable Object> extends D<P>{}
  void test1() {
      // BUG: Diagnostic contains: Cannot assign from type
      D<String> f = new B<@Nullable String>();
  }
}
```
- nested generics 
`A<B<String>, String> a = new A<B<@Nullable String>>();`

The PR does not handle pseudo-assignments due to parameter passing / returns; that support will come in a follow-up PR.  Also note that this PR only changes NullAway behavior when `JSpecifyMode` is enabled.

Additionally, we don't currently have functioning support for checking compatibility of method references, lambdas, or inferred generic instantiations, but this PR includes tests to show that those cases do not produce false positive errors (just false negatives / missed detections).

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