[Frameworks] Add an 'am' cmd option to enable streaming in profiling.

Add option '--streaming' to 'am start' and 'am profile' commands.
If the option is given, the output of method trace profiling
will be streamed into the specified file, so the output is no
longer limited by the buffer size.

Test: m -j48 test-art-host;
m -j48 ART_TEST_TRACE=true ART_TEST_TRACE_STREAM=true test-art-host;
I also tested manually. Tried all 8 combinations of
    sampling/instrumention
    streaming/non-streaming
    'am start --start-profiler' / 'am profile start'
The output files are all in expected shape.

Bug: 33300765

Merged-In: I8a5136a1c7330c8260b7c6c8da63f42a73aee275

Change-Id: I8a5136a1c7330c8260b7c6c8da63f42a73aee275