MAINTAINERS: MAINTAINERS.yml updates

The changes here are the result of running all open pull-requests
through a script to identify the assignee and findi ng many gaps or old
data. Some of the changes here are coming from pending PRs that were
waiting for some TSC confirm ation, others are done based on pending
maintainer and collaborator changes that were not submitting yet.

Two noteable changes:

- CMake/Build system: This is now limited to just the infrastructure and
not every single Cmake file in the tree.  - Documentation: ditto, this
is just for the doc infrastructure and not for every RST file in the
tree.

The reason for the above two changes is the fact that most PRs would
have some cmake or doc changes and assignees in this case should not be
the owners of the build system or the doc infra, instead we should
assign to the subsystem being changed. (Otherwise majority of PRs would
be assigned to the doc and build system maintainers).

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif