[Feature] Combine array and value identifier functions in translation metadata

[hdwalters]

Is your feature request related to a problem? Please describe.
I needed to create a temporary array and a temporary value, but I didn't realise there was a gen_array_id() function:

let array = format!("__AMBER_ARRAY_{}", meta.gen_value_id());
let line = format!("__AMBER_LINE_{}", meta.gen_value_id());

I therefore ended up with duplicate array names, creating a hard-to-track-down bug.

Describe the solution you'd like
It doesn't make sense to have separate gen_array_id() and gen_value_id() functions; I propose to combine them.

Describe alternatives you've considered
N/A

Additional context
N/A