PDL: add regression tests for ‘pdl’ output

These new tests compare the output of ‘pdl’ with the output of
‘bluetooth_packetgen’ and ensures that we match this.

We will later decouple the two generators, but for now, it’s useful to
generate identical output.

Bug: 228307941
Test: atest pdl_tests
Change-Id: Ie45ddd9fceeeefa9ad25c649bfc4db903f9fe1c2