ut-core : Feature: Add support in auto-generate script to generate CPP tests for GTEST

[kanjoe24]

Problem/Opportunity

This feature will enable autogenerate script to generate CPP tests for GTEST

Proposed Solution

AIDL team has already used ut-core to generate their CPP tests. Need to liaise with them and develop script that can best suit this requirement.

Acceptance Criteria (Optional)

user must be able to generate CPP tests using a user provided header file, as is being done today for generating C tests.

Additional Notes (Optional)

No response