Feature identify min avg max soil temp2

[dschlaep]

• new get_soiltemp() provides a consistent interface across versions

• previous attempts with get_soiltemp_avg() and get_surfacetemp_avg() were too limited (e.g., they only delivered average temperatures consistently but not min/max)

[codecov[bot]]

Codecov Report

Merging #199 (d1603cc) into release/v3.5.1 (a8b45de) will increase coverage by 0.17%. The diff coverage is 82.43%.

:exclamation: Current head d1603cc differs from pull request most recent head d687d1c. Consider uploading reports for the commit d687d1c to get more accurate results

@@                Coverage Diff                 @@
##           release/v3.5.1     #199      +/-   ##
==================================================
+ Coverage           54.42%   54.60%   +0.17%     
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  Files                  42       42              
  Lines                6451     6500      +49     
==================================================
+ Hits                 3511     3549      +38     
- Misses               2940     2951      +11     

Impacted Files	Coverage Δ
R/sw_OutputDerived_Functions.R	81.48% <82.43%> (-3.27%)	:arrow_down:

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