Clean up BOTMETA.yml (#44574)

This PR includes:
- Removal of maintainers that are listed as author in the module
- Removal of entries that do not extend the original author list
- Move ignored-statement to namespace/directory (where useful)
- In some cases, fix the authors-list or add missing github id

We end up with a list of exceptions/additions and a large set of
namespace/directory maintainers or team of maintainers.

Some entries could be further improved by discussing with some
maintainers.

lib/ansible/modules/cloud/amazon/ec2_instance_facts.py

@@ -18,8 +18,8 @@ description:
     - Gather facts about ec2 instances in AWS
 version_added: "2.4"
 author:
-  - Michael Schuett, @michaeljs1990
-  - Rob White, @wimnat
+  - Michael Schuett (@michaeljs1990)
+  - Rob White (@wimnat)
 requirements: [ "boto3", "botocore" ]
 options:
   instance_ids: