Add support for loading CRS in CDM formats

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.00000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 93.33%. Comparing base (f949997) to head (9e072bb). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/extra/cdm.jl	78.00%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #122 +/- ## ========================================== - Coverage 94.02% 93.33% -0.70% ========================================== Files 18 18 Lines 1122 1170 +48 ========================================== + Hits 1055 1092 +37 - Misses 67 78 +11 ```

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