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Since imagecapture.js starts to contain many things that has nothing to
do with ImageCapture, this CL refactor it as following:

1. Splits imagecapture.js into MojoConnector, DeviceOperator and
   ImageCapture to make it clearer and more extensible.
2. Avoids using singleton pattern for mojo connection.
3. For camera Hal v1, simplifies the check and remove try/catch
   mechanism.

Bug: 979104
Test: tast run DUT camera.CCA*
Test: Running above test for v1/v3 devices

Change-Id: I8b93e05a566ae81731c1e8f71cd00baa82d641f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1739035
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690181}