Fix missing includes & bazel target dependencies

[MaciejKaszynski]

What

We have a lot of missing/not needed includes which should be fixed.
There are also some Bazel targets that rely on dependencies inherited from other dependencies which should also not happen.

Would be great if we had CI to check and reject changes that break this.

Acceptance Criteria (DoD)

• Includes fixed.
• All Bazel targets shall depend on what they use.
• CI setup to reject bad changes.

How

• include-what-you-use is a standard tool to fix the includes.
• depend_on_what_you_use Is a similar tool I've found but not sure how know this is.

[danth]

• IWYU is checking that each symbol has a corresponding #include
• DWYU is checking that each #include has a corresponding Bazel dependency
  • layering_check is built in to Bazel and may do the same thing