Collect .hpa.condition gauges

[xvello]

What does this PR do?

Collect the kube_hpa_status_condition metric as kubernetes_state.hpa.condition.
Gauges are to sum by condition and status.

Review checklist

• PR has a meaningful title or PR has the no-changelog label attached
• Feature or bugfix has tests
• Git history is clean
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo
• If PR adds a configuration option, it has been added to the configuration file.

Additional Notes

Anything else we should know when reviewing?

[codecov]

Codecov Report

Merging #3107 into master will decrease coverage by 3.1%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3107      +/-   ##
==========================================
- Coverage   84.97%   81.86%   -3.11%     
==========================================
  Files         676        4     -672     
  Lines       34940      353   -34587     
  Branches     4188       68    -4120     
==========================================
- Hits        29689      289   -29400     
+ Misses       4032       44    -3988     
+ Partials     1219       20    -1199

[xlucas]

LGTM 👍