Add support for loading CRS from WKT strings

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.06%. Comparing base (0ed8ccb) to head (ea49865).

Files	Patch %	Lines
src/conversion.jl	87.50%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #99 +/- ## ========================================== + Coverage 94.72% 95.06% +0.34% ========================================== Files 17 17 Lines 1080 1075 -5 ========================================== - Hits 1023 1022 -1 + Misses 57 53 -4 ```

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