feat: make generated code more idiomatic to go users

[nilslice]

Convert any end-user facing identifier to a more Go-friendly option, using the latest helpers in xtp-bindgen. e.g.:

For this schema portion:

snake_case_func_name:
    description: This is a function that uses snake case in the name
    input:
      type: string
      contentType: text/plain; charset=utf-8
      description: A string passed into plugin input
    output:
      $ref: "#/components/schemas/some_value"
      contentType: application/json
#...
components:
  schemas:
    some_value:
      properties:
        a_string:
          type: string
          description: a string

We now produce:

// This is a function that uses snake case in the name
// It takes string as input (A string passed into plugin input)
// And returns SomeValue ()
func SnakeCaseFuncName(input string) (SomeValue, error) {
	// TODO: fill out your implementation here
	panic("Function not implemented.")
}

[chrisdickinson]

LGTM!