doclava17: Implement TypeVariableImpl

Bug: 260694901
Test: ./gradlew e2eTestAOSP
Test: ./gradlew doclava17:test
Merged-In: I977b155b2754b98c537f3cf650a5fcd618a941a1
Change-Id: I977b155b2754b98c537f3cf650a5fcd618a941a1
1 file changed