Add append option to zabbix_maintenance module

[notok]

SUMMARY

Add append option to zabbix_maintenance module to append hosts or host groups to existing maintenance.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

community.zabbix.zabbix_maintenance

ADDITIONAL INFORMATION

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.19%. Comparing base (4c3966f) to head (cfe7d8f).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
plugins/modules/zabbix_maintenance.py	72.72%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1438      +/-   ##
==========================================
+ Coverage   78.17%   78.19%   +0.01%     
==========================================
  Files          46       46              
  Lines        5756     5761       +5     
  Branches     1474     1476       +2     
==========================================
+ Hits         4500     4505       +5     
  Misses        775      775              
  Partials      481      481              

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