[1/n] Include input feature flags in KeyInterceptionInfo

For "keyboard capture" feature, we plan to use input feature
flags and this is just passing that flag details in
KeyInterceptionInfo object.

DD: go/key_capture
Bug: 416681006
Flag: com.android.hardware.input.request_key_capture_api
Test: Presubmits
Change-Id: I802dde5da5433f3c0a256f0f11909e454fe849f5