Add Resolver to new iamc sub-package

[coroa]

Resolver allows to consolidate variables by composing variants.

Example

co2emissions = ar6.loc[isin(gas="CO2")]
r = Resolver.from_data(co2emissions, "sector", ["AFOLU", "Energy"])
r["Energy"] |= r["Energy|Demand"] + r["Energy|Supply"]
r["AFOLU"] |= r["AFOLU|Land"] + r["AFOLU|Agriculture"]
r.as_df()

TODO

• Add documentation
• Add simple tests

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 292 lines in your changes missing coverage. Please review.

Project coverage is 60.64%. Comparing base (6fbaa99) to head (d6a5cd2).

Files with missing lines	Patch %	Lines
src/pandas_indexing/iamc/resolver.py	0.00%	291 Missing ⚠️
src/pandas_indexing/iamc/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #60       +/-   ##
===========================================
- Coverage   81.38%   60.64%   -20.74%     
===========================================
  Files           9       11        +2     
  Lines         854     1146      +292     
  Branches      150      183       +33     
===========================================
  Hits          695      695               
- Misses        130      422      +292     
  Partials       29       29               

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