adds carbon resources and indicators

[goergen95]

FYI @karpfen

[codecov]

Codecov Report

Attention: Patch coverage is 89.51049% with 15 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@3d98846). Learn more about missing BASE report.
Report is 1 commits behind head on main.

Files	Patch %	Lines
R/get_carbon.R	80.32%	12 Missing ⚠️
R/calc_carbon.R	96.34%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #339   +/-   ##
=======================================
  Coverage        ?   86.96%           
=======================================
  Files           ?       56           
  Lines           ?     2578           
  Branches        ?        0           
=======================================
  Hits            ?     2242           
  Misses          ?      336           
  Partials        ?        0           

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