BluetoothMidi test: test encoder and decoder

Also test MidiFramer
Add end-to-end test through encoder and decoder.
Add test for reserved bit in header.

Bug: 35669198
Bug: 140638458
Bug: 149927520
Test: atest BluetoothMidiTests
Change-Id: I767deab6847d2b45e01bed29f5eed3df0f0e46c0
Merged-In: I767deab6847d2b45e01bed29f5eed3df0f0e46c0
11 files changed