Add modules/bentleyottmann to IWYU

Check IWYU holds with:

bazelisk build //modules/bentleyottmann:bentleyottmann --config=enforce_iwyu --config=for_linux_x64_with_rbe --jobs=100

Bug: b/297220808
Change-Id: I5aba78a637921deb014075c2e600829fb6ed02e9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/770598
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Herb Derby <herb@google.com>
13 files changed