Add VQDS service base files

Create LnT service base classes that with only update function. A
corresponding detector class that manages the lifecycle of VQDS and
system server connections will be added in a separate CL (b/261783492).

Bug: 261783491
Test: atest CtsVoiceInteractionTestCases
Change-Id: I622e0b0036d9b2d4257468fb55d6d1b01052968c
API-Coverage-Bug: 264039061