Packet: Shard pybind11 Python binding generation for faster compilation

* Shard Python binding generation into 5 shards to utilize the
  parallelism on the build servers to get faster compilation time
* Also add missing includes in some packet headers

Bug: 143374372
Test: mm -j40 at system/bt
Change-Id: Ic0281494e30f789835e1075e249b031ba8338089