[LTC] Code-gen floor, frac, and trunc (#66770)
Summary:
This commit adds code-gen support for the ops floor, frac, and trunc.
Test Plan:
test/cpp/build/test_ptltc --gtest_filter=AtenLtcTsTensorTest.TestFloor:AtenLtcTsTensorTest.TestFrac:AtenLtcTsTensorTest.TestTrunc
