Feature: Expose `_parameters` in `MethodBuilder`

[zsr2531]

Summary: There is no way to get the parameters of a method, so maybe make that field a public property instead?

[zsr2531]

A very nasty workaround to solve this issue is to use reflection, but yeah...

[dansiegel]

what is the purpose of making the parameters public? it'd be helpful to know the problem you're looking to solve there

[zsr2531]

For my use case, I am using this library to create classes that read/write JVM attributes. If my generator encounters a non-primitive typed property (ie. a user defined class or a List for example), it creates a BuildX method so that the generated code looks nicer and conforms to the style of builders/factories that are written by hand. (example) Obviously, I don't want to generate 2 methods for the same type, as that would result in invalid code. So I check if there has already been a method generated for it. (example)