Add support for log-handler

This handler is based off of version handler with major differences in
handler_builder

Tested:
created the blackbox blob successfully using this lib.
Read the data from

Add support for log-handler

This handler is based off of version handler with major differences in
handler_builder

Tested:
created the blackbox blob successfully using this lib.
Read the data from the blob using a host side tool

Signed-off-by: Gaurav Gandhi <gauravgandhi@google.com>
Change-Id: I9ef775af752156a1647453ff3831ef4c0449d546

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