Sync C# Array with Core

- Add `AddRange` method.
- Add `Fill` method.
- Add `Max` and `Min` methods.
- Add `PickRandom` method.
- Add `Reverse` method.
- Add `RecursiveEqual` method.
- Add `Sort` method.
- Add `Slice` and `GetSliceRange` methods.
- Add `IndexOf` overload that takes an index parameter.
- Add `LastIndexOf` method.
- Add `BinarySearch` method.
- Add/update documentation.

core/variant/array.cpp

@@ -612,14 +612,14 @@ void Array::shuffle() {
 	}
 }
 
-int Array::bsearch(const Variant &p_value, bool p_before) {
+int Array::bsearch(const Variant &p_value, bool p_before) const {
 	Variant value = p_value;
 	ERR_FAIL_COND_V(!_p->typed.validate(value, "binary search"), -1);
 	SearchArray<Variant, _ArrayVariantSort> avs;
 	return avs.bisect(_p->array.ptrw(), _p->array.size(), value, p_before);
 }
 
-int Array::bsearch_custom(const Variant &p_value, const Callable &p_callable, bool p_before) {
+int Array::bsearch_custom(const Variant &p_value, const Callable &p_callable, bool p_before) const {
 	Variant value = p_value;
 	ERR_FAIL_COND_V(!_p->typed.validate(value, "custom binary search"), -1);