Add the ability to query for particuar component and filter fields

When running local API /privet/v3/components add the ability to pass
extra parameters such as 'path' to specify a component path and 'filter'
to include only specified component properties.

BUG: 26159356
Change-Id: I7a5de42c2acff94dac2ad71874a0ade6f91fb064
Reviewed-on: https://weave-review.googlesource.com/1931
Reviewed-by: Alex Vakulenko <avakulenko@google.com>