feat(grafana_datasource): add tls_servername argument

[Nemental]

SUMMARY

Fixes #389

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

ADDITIONAL INFORMATION

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 64.28%. Comparing base (fff9558) to head (bc4a74d).
Report is 58 commits behind head on main.

Files	Patch %	Lines
plugins/modules/grafana_datasource.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #395       +/-   ##
===========================================
+ Coverage   45.63%   64.28%   +18.65%     
===========================================
  Files          21       16        -5     
  Lines        2220     1753      -467     
  Branches      433      377       -56     
===========================================
+ Hits         1013     1127      +114     
+ Misses       1167      452      -715     
- Partials       40      174      +134     

Flag	Coverage Δ
integration	70.51% <0.00%> (?)
sanity	23.21% <0.00%> (-0.19%)	⬇️
units	?

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[rndmh3ro]

lgtm!