Use temperature to decide if we need to focus again

[danjampro]

• Adds functionality to trigger new coarse / fine focus in temperature shifts by too much
• Consolidates existing coarse_focus_required and fine_focus_required properties
• Adds / modifies tests to cover changes

Closes #430

[codecov[bot]]

Codecov Report

Merging #433 (ab0d516) into develop (e07cc8a) will increase coverage by 0.68%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #433      +/-   ##
===========================================
+ Coverage    56.48%   57.16%   +0.68%     
===========================================
  Files           57       57              
  Lines         3750     3805      +55     
  Branches       397      397              
===========================================
+ Hits          2118     2175      +57     
+ Misses        1530     1529       -1     
+ Partials       102      101       -1     

Impacted Files	Coverage Δ
src/huntsman/pocs/observatory.py	70.80% <100.00%> (+3.21%)	:arrow_up:
tests/test_observatory.py	96.29% <100.00%> (+1.62%)	:arrow_up:
src/huntsman/pocs/archive/archiver.py	88.18% <0.00%> (-1.82%)	:arrow_down:

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