GD-HCI: Implement snoop rotation and options parsing

* Implement btsnoop log rotation that creates a new log
  after logging 0xFFFF (65535) packets
* Implement btsnoop log mode parsing from system properties

Bug: 163733538
Test: atest bluetooth_test_gd
Tag: #gd-refactor
Change-Id: I577339bc5a6cd9f814a00916cb85099bda7b06da