[jira] Add Jira Plugin

[ricoberger]

The Jira plugin can be used to access issues from a Jira instance in
kobs. The user must provide an email address and API token to use the
plugin. The plugin can be used in panels and in the notification, e.g.
to show the users active sprint or the issues he is assigned to.

• I added a CHANGELOG entry for this change.
• I adjusted the corresponding documentation for this change.
• I adjusted the values.yaml file and the documentation for all values.

[codecov-commenter]

Codecov Report

Merging #414 (076baf4) into main (819f428) will decrease coverage by 0.83%.
The diff coverage is 7.34%.

@@            Coverage Diff             @@
##             main     #414      +/-   ##
==========================================
- Coverage   47.19%   46.35%   -0.84%     
==========================================
  Files         136      139       +3     
  Lines       11534    11776     +242     
==========================================
+ Hits         5443     5459      +16     
- Misses       5951     6176     +225     
- Partials      140      141       +1     

Impacted Files	Coverage Δ
cmd/kobs/main.go	0.00% <0.00%> (ø)
pkg/hub/api/applications/topology.go	0.00% <0.00%> (ø)
plugins/plugin-jira/cmd/jira.go	0.00% <0.00%> (ø)
plugins/plugin-jira/pkg/instance/instance.go	0.00% <0.00%> (ø)
plugins/plugin-jira/pkg/instance/helpers.go	81.25% <81.25%> (ø)
pkg/hub/api/applications/applications.go	100.00% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more