Add netconf_get module (#39869)
* Add netconf_get module
Implements part-1 of proposal #104
https://github.com/ansible/proposals/issues/104
* Add netconf_get module
* Refactor `get`, `get_config`, `lock`, `unlock`
and `discard_changes` netconf plugin api's
* Add netconf module_utils file which netconf module
related common functions
* Refactor junos and iosxr netconf plugins
* Fix source option handling
* Fix review comments
* Update botmeta file
* Update review comments and add support for lock
* Lock update fix
* Fix CI issue
* Add integration test and minor fixes
* Fix review comments
* Fix CI failure
* Fix CI issues
* Fix CI issues
* Fix review comments and update integration test
* Fix review comments
* Fix review comments
* Fix review comments
Fix reveiw comments
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