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In order to support other compression formats in imageWriterPrivate,
UnzipHelper is renamed to ZipExtractor and its arguments are split into
ExtractionProperties, so that other extractor classes can easily take
the same set of arguments.

Also this CL simplifies the lifecycle of the class by managing it on
its own.

This refactoring is described in "Adding multiple compression format
supports" section of the design doc.

Design doc: http://go/tar-xz-cros-recovery

TEST=manually verified that zip file flashing and normal file flashing
are working in Recovery Utility
TEST=ImageWriterOperationTest
BUG=b:153027505

Change-Id: I505bd426b163500926d0acae5947f6c3f0531758
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573963
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843494}