Support a PerfettoTrace Java API

Added a layer on top of the Perfetto C SDK that allows
creating equivalent 'PerfettoTeHl' structs on the heap.

This makes it possible for Java objects to control the
lifetime of these objects through JNI.

Each PerfettoTeHl struct has an equivalent C++ class allocated
on the heap which is in turn managed by an equivalent Java
class managed by the Java heap.

This design allows us to allocate objects once and re-use them
to serialize the trace event data from Java into the shmem.

The Java layer is responsible for caching the Perfetto Java
objects to avoid GC churn.

Test: atest PerfettoTraceTest
Change-Id: Ibb08e8b6cab7d86ac2c1d57c621c9074a4cb4077
Bug: 303199244
Flag: android.os.perfetto_sdk_tracing_v2

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