Add a new 'era5' function that downloads data from Copernicus ERA5.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 47.29730% with 39 lines in your changes missing coverage. Please review.

Project coverage is 85.66%. Comparing base (b547924) to head (6b943e6).

Files with missing lines	Patch %	Lines
src/extras/weather.jl	44.11%	38 Missing ⚠️
src/utils.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1714      +/-   ##
==========================================
- Coverage   85.89%   85.66%   -0.24%     
==========================================
  Files         167      167              
  Lines       23377    23446      +69     
==========================================
+ Hits        20080    20084       +4     
- Misses       3297     3362      +65     

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