allow setting annnotations on zalenium hub via helm chart

[pschuermann]

Description

This change will let you set annotations on the zalenium hub pod via helm chart values, see #1005

Motivation and Context

People use annotations to configure logging or monitoring e.g. configure sumologic log collector via annotation to read the zalenium hub logs

How Has This Been Tested?

Created an annotation and ran the helm chart locally on kubernetes.
Zalenium started and the annotation was set correctly

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #1006 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1006   +/-   ##
=========================================
  Coverage     54.99%   54.99%           
  Complexity      675      675           
=========================================
  Files            58       58           
  Lines          4562     4562           
  Branches        429      429           
=========================================
  Hits           2509     2509           
  Misses         1818     1818           
  Partials        235      235

[arnaud-deprez]

Looks good to me.
@diemol will merge it when he is back.

[diemol]

Thank you for your contribution @pschuermann!

[diemol]

Thanks for reviewing @arnaud-deprez!

[axozoid]

Shouldn't we update the documentation to reflect this?