Support custom prefixes of generics and interfaces

[G-Rath]

We have a convention that generics should either be a single letter or start with two uppercase letters e.g. either T or TKey; I also know some teams have the convention of prefixing their interfaces with I.

It would be great if we could pass something like --prefix-generics=T and --prefix-interface=I to facilitate this

[marcolink]

Hi @G-Rath,
Would you be interested in opening a PR for it?
There is a central point where we compute all module and entity names.

[G-Rath]

@marcolink sorry for not getting back sooner - I did have a go at implementing this after opening the issue but found its not as straightforward as it might seem; however when writing this out I realised how I should be able to simplify my implementation so I should hopefully have a PR up shortly :)