[draft] componentType parser

[pavelsavara]

There are 2 component types in the mock model.

(type (;0;)
    (instance
      (type (;0;) (record (field "name" string) (field "head-count" u32) (field "budget" s64)))
      (export (;1;) "city-info" (type (eq 0)))
      (type (;2;) (func (param "message" string)))
      (export (;0;) "send-message" (func (type 2)))
    )
  )

AND

(type (;2;) (func (param "info" 1)))

This parser covers only the code paths required for parsing the static model that we use for tests. It means that it's not generalized for all use cases.