Feature Request: real_array_t similar to integer_array_t

[abaebae]

Hi, we use the fixed_pkg for a lot of signal processing stuff. We read the input data from csv and write the result back to csv and verify with post_check functions. Functionality similar to the integer_array_pkg would reduce the overhead of converting to integer and vice versa.
I would like to work on a draft for this, unless this is not a useful idea.

[nselvara]

I think making a generic type package would solve the problem.

[daedadu]

I would like something like this as well, I'm currently doing some signal processing with sfixed vhdl types and casting to signed lets me run into the 32 bit signed problem...

[LarsAsplund]

This is related to #521