Mark Java's `instanceof` pattern variables as `@local.definition.var`

Java's instanceof pattern matching contains a variable declaration. Take for example o instanceof String s.
In this example the variable s of type String is declared. Therefore, s should be marked as a variable declaration @local.definition.var. It is not.

Scopes
Ideally the variable declaration is also assigned the correct scope. But this seems complicated, because the scope depends on control-flow. The scope specification can be found here. These are some examples illustrating the scopes:

if (e instanceof String s1) {
  System.out.println(s1); // valid
} else {
  System.out.println(s1); // error: s1 not in scope
}

if (!(e instanceof String s2)) {
  System.out.println(s2); // error: s2 not in scope
} else {
  System.out.println(s2); // valid
}

if (!!(e instanceof String s3)) {
  System.out.println(s3); // valid
} else {
  System.out.println(s3); // error: s3 not in scope
}

if (!(e instanceof String s4)) {
  System.out.println(s4); // error: s4 not in scope
  return;
}
System.out.println(s4); // valid

Start by locating the Java Tree-sitter query handling instanceof pattern variables and read the linked JLS scope specification, especially section 6.3.2. Done means the declared pattern variable is marked with @local.definition.var, with its scope handled where feasible according to the examples in the issue.