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

.github/BOTMETA.yml

@@ -476,7 +476,8 @@ files:
   $modules/network/layer2/: $team_networking
   $modules/network/layer3/: $team_networking
   $modules/network/meraki/: $team_meraki
-  $modules/network/netconf/netconf_config.py: ganeshrn lpenz userlerueda
+  $modules/network/netconf/netconf_config.py: lpenz userlerueda $team_networking
+  $modules/network/netconf/netconf_get.py: wisotzky $team_networking
   $modules/network/netscaler/: $team_netscaler
   $modules/network/netvisor/: $team_netvisor
   $modules/network/nuage/: pdellaert
@@ -864,6 +865,9 @@ files:
   $module_utils/network/meraki:
     maintainers: $team_meraki
     labels: networking
+  $module_utils/network/netconf:
+    maintainers: $team_networking
+    labels: networking
   $module_utils/network/netscaler:
     maintainers: $team_netscaler
     labels: networking