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

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

Change-Id: I9c0aa28da361397ab4c4b9777103da0dbe1ca55a
Signed-off-by: Automerger Merge Worker <[email protected]>