ScanManager: Split native interface from ScanManager

- Allows to run unit test cases with hw offload scan filter
- Adds batch scan unit test cases

Bug: 261228018
Test: atest BluetoothInstrumentationTests and manual hw scan filter test on device
Tag: #feature
Change-Id: I41f56e7668030bbf3bf7db39dd110b80aabc3f30