Rename the era5 to ecmwf and add a method to download forecast data.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.78313% with 45 lines in your changes missing coverage. Please review.

Project coverage is 85.79%. Comparing base (f39411f) to head (5580df1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/extras/weather.jl	45.12%	45 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1717      +/-   ##
==========================================
- Coverage   85.92%   85.79%   -0.14%     
==========================================
  Files         167      167              
  Lines       23499    23569      +70     
==========================================
+ Hits        20192    20220      +28     
- Misses       3307     3349      +42     

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