Use custom prefix for getters

[thesw4rm]

Currently, getset only supports a hardcoded get_ prefix for legacy support. There are various use cases where a getter would need a custom prefix attached to it. For example, when writing Mock classes for testing.

amplify already supports this feature

I am already working on adding custom prefixes in, and created this issue to track that work.

[jbaublitz]

@thesw4rm Okay I can take a look. It may be a bit before I get the chance to review the code. Feel free to ping me if it drops off my radar.

[thesw4rm]

@jbaublitz ping

I've got a PR elsewhere blocked by this.

I know you're busy so if you've got a moment, much appreciated

#129

[thesw4rm]

@jbaublitz hey, got any time for this?

[jbaublitz]

@thesw4rm I will try to review this today. I have a record number of PRs and issues popping up across my projects so it's a little bit hard to get to everything in a timely manner.