cpanm - revamp module (#2218)

* copying from the previous branch

* passing sanity - docs incomplete

* adjusted parameter name

* adjusted unit tests for mode=new

* adjusted integration tests for mode=new

* added 'russoz' to list of maintainers for cpanm

* Update tests/integration/targets/cpanm/tasks/main.yml

* Update tests/integration/targets/cpanm/tasks/main.yml

* ensuring backward compatibility + tests

* added changelog fragment

* version for new parameter and adjusted example

* typo and formatting

* Update plugins/modules/packaging/language/cpanm.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/modules/packaging/language/cpanm.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/modules/packaging/language/cpanm.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* multiple changes

- some fixes from PR
- supporting tests
- integration is no longer unsupported => destructive, should run on
  apt- and rpm-based systems only

* only run integration tests in redhat-family > v7 or debian-family

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/2218-cpanm-revamp.yml

@@ -0,0 +1,5 @@
+minor_changes:
+  - cpanm - rewritten using ``ModuleHelper`` (https://github.com/ansible-collections/community.general/pull/2218).
+  - cpanm - honor and install specified version when running in ``new`` mode; that feature is not available in ``compatibility`` mode (https://github.com/ansible-collections/community.general/issues/208).
+deprecated_features:
+  - cpanm - parameter ``system_lib`` deprecated in favor of using ``become`` (https://github.com/ansible-collections/community.general/pull/2218).