Update ScanManager to cache registered MSFT patterns

Some chipsets fail to register the same AdvMon pattern. Cache
the registered patterns so we only register them once.

Bug: 373753239
Bug: 365787977
Flag: com.android.bluetooth.flags.le_scan_msft_support
Test: Manually examine snoop log
Test: atest BluetoothInstrumentationTests:ScanManagerTest
Test: atest BluetoothInstrumentationTests:MsftAdvMonitorMergedPatternListTest
Change-Id: I1f5af35a8ff4812f0e9ee388c1152a73bbd6788b