Cannot override the `__str__` for a records or deftypes

[chrisrink10]

It is either not possible or not easy to customize the str output for a type or record right now:

(definterface Shape
  (area []))

(defrecord Circle [radius]
  Shape
  (area [self]
    (* 3.14 radius radius))

  (__str__ [self]
    (str "radius: " radius)))

(str (->Circle 1))  ;; => "#basilisp.user.Circle{:radius 1}"

This is likely due to the messy and convoluted relationship between basilisp.lang.obj.lrepr and basillisp.core/str.