Add "did you mean" suggestions for functions and procedures

[eminence]

Works with built-in functions and procedures, and user-defined functions:

>>> fn foo_bar<T>(t: T) = t

  fn foo_bar<T>(t: T) -> T = t

>>> foobar(4)
error: while type checking
  ┌─ <input:5>:1:1
  │
1 │ foobar(4)
  │ ^^^^^^ unknown callable
  │
  = Did you mean 'foo_bar'?

>>> assertt(true)
error: while type checking
  ┌─ <input:6>:1:1
  │
1 │ assertt(true)
  │ ^^^^^^^ unknown callable
  │
  = Did you mean 'assert'?

>>> ceiling(4.5)
error: while type checking
  ┌─ <input:7>:1:1
  │
1 │ ceiling(4.5)
  │ ^^^^^^^ unknown callable
  │
  = Did you mean 'ceil'?

[sharkdp]

Cool, thank you very much!