[iOS][BWG] Create config to pass to new BWG API.

Also added OWNERS file for i/c/test/providers/*

Four-CL change:
-> crrev.com/c/6652423
   crrev.com/i/8363036
   crrev.com/c/6652424
   crrev.com/i/8363037

Bug: 422506000
Change-Id: I7dc4e4257d7e852e74e6d2a7c86646509a6eeb3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6652423
Commit-Queue: Nicolas MacBeth <nicolasmacbeth@google.com>
Reviewed-by: Adam Arcaro <adamta@google.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1476723}