Refactor the Namespace config to simplify usage

[mszostok]

Overview

Refactor the Namespace config to simplify usage.

Acceptance Criteria

• [ ] change include/ignoreto include/exclude
• [ ] support regex in both cases (include/exclude)
• [ ] remove the all keyword. We will have regex for include, so *will match all namespaces.
• [ ] add validation to print warning when include matches all namespaces but on the list there are more items. Because in this case, we will match all Namespaces anyway.
• [ ] Update documentation

Reason

See epic https://github.com/kubeshop/botkube/issues/596