Make translator between grid subset names and indices

[dautt-silva]

Modifty get_grid_subset_with_index. Rename it to get_grid_subset and a a second function that accepts the name as a string.
Changes to be committed:
modified: src/interpolations.jl
modified: src/recipes.jl
modified: src/subset_tools.jl

[anchal-physics]

Please run JuliaFormatter.format on edited files to conform to our formatting convention. Normally, if you use VScode, it would automatically do it for you. Alternatively, you can run the following code in the repo directory before committing:

julia -e 'using JuliaFormatter; format(".", verbose=true)'

You might have to install it in your default julia environment. See instructions here.
Once you have installed JuliaFormatter in your default julia environment, you can also install a pre-commit in your repo to avoid running this manually. It will then run automatically as you commit your changes. To do this, do the following:

cd GGDUtils.jl
echo "#\!/bin/bash"| cat >> .git/hooks/pre-commit
echo "julia -e 'using JuliaFormatter; format(\".\", verbose=true)'" | cat >> .git/hooks/pre-commit
chmod +x .git/hooks/pre-commit

Then everytime you commit, the formatter will run and will cause an error if it can't format the files.

[anchal-physics]

• Format needs fixing
• Docstring for second method is incorrect
• Please add example of using get_grid_subset(grid_ggd, grid_subset_name) to demostrate the use to new method.