New version: ERA5Reanalysis v0.4.0

[JuliaRegistrator]

• Registering package: ERA5Reanalysis
• Repository: https://github.com/GeoRegionsEcosystem/ERA5Reanalysis.jl
• Created by: @natgeo-wong
• Version: v0.4.0
• Commit: e5ad62f72c55651b66f35da1d6fd710ee92623c3
• Reviewed by: @natgeo-wong
• Reference: GeoRegionsEcosystem/ERA5Reanalysis.jl@e5ad62f#commitcomment-152598119
• Description: Dealing with ERA5 Reanalysis datasets
• Release notes:

* A lot of breaking changes in order to accommodate the upgrades and changes made by the Climate Data Store (CDS) late last year
* All previously downloaded files for v0.3 are no longer compatible with this current version. You will either need to convert or redownload those files
* Bump to GeoRegions v7 and adding RegionGrids and LandSea to merge with the rest of the GeoRegions Ecosystem
* This is also a preparatory release for GeoRegionsv8, RegionGridsv0.1 and LandSeav0.1, coming in the near future

## Breaking Changes
* ERA5 datasets retrieved from the CDS are now natively in `Float32` format, and thus all files downloaded using ≤v0.3 are no longer compatible with the functions
* Time dimension and variables are now saved under the ID `valid_time` to make them standardized with the CDS
* A lot of changes to how ERA5Variables are handled, I am attempting to make it more "project"-based like how I did for GeoRegionsv7 and above

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