Implement per-field matching of ScanRecord.

As part of building out support for robustly matching Bluetooth LE
devices in the wild, this change checks all "fields" contained in a
ScanRecord against a given BytesMatcher.

To support matching variable-length Eddystone beacons, this change
also expands BytesMatcher to support both exact length and prefix
based rules, which are then used with rules that verify that example
Eddystone and iBeacon values can be detected with these rules:

    Eddystone: ⊆0016AAFE/00FFFFFF
    iBeacon: ⊆00FF4C0002/00FFFFFFFF

Expands testing to confirm all newly added capabilities are working.

Bug: 181812624
Test: atest BluetoothTests:android.bluetooth.le
Test: atest FrameworksCoreTests:android.os.BytesMatcherTest
Change-Id: I1cff8e08604436f4bba6f55aad64c3ce5969bf56