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Add ComponentInspectorForProcess to manage a singleton per component.
Add static functions to inspect.* as a helper to publish version and
last revision.

Test: Added InspectTest to cr_fuchsia_base_unittests
Bug: 1061245
Change-Id: I0918b183fecedcd9a4c70685f7b7a166b2d82732
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2173238
Commit-Queue: Sharon Yang <yangsharon@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774917}