Introduce ResourceNamedType that represents pair of name + ResourceType.

This type will be used as part of ResourceName to support types with
custom names inside aapt2.

DD: go/custom-resource-types-in-aapt2

Bug: b/215108200
Test: Resource_test.cpp
Change-Id: Ib09776e6b2f69fefb9724136a345dc25bea42573