Initial import of kotlinpoet from upstream master am: 8b6cde9a0e am: 920796b32b am: 3870e30a31

Original change: https://android-review.googlesource.com/c/platform/external/kotlinpoet/+/2413152

Change-Id: Ic663a7bfaf78e703948aa55c9b9555d87a035ebd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>