[task #15109] Size of dataset as an Arithmetic operator

[Sachin Kumar Singh]

Follow-up Comment #7, task #15109 (project gnuastro):

For the second argument(the required dimension, let it be called `arg`), I've
used `gal_data_t' as well. To use this value, I've used its arg->array,
because on inspection it showed a size to be 1, which is desired. But I'm
aware it is a void pointer and on dereferencing with a long typecast is
showing a large random number. How to fix this? how can I get the value of the
second operator?

Also on testing with `during-dev.sh`, it is reported that the `size` is not a
valid operator. But the printf debugger works fine and shows all dimensions
correctly. I've pushed the repo on
GitHub:[https://github.com/sachinkumarsingh092/gnuastro/tree/task-arithop-size]

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