Function lazy

lazy<T>(thunk): Parser<T>
Defers evaluation of a parser, allowing recursive parser definitions. Without lazy, you can't reference a parser before it's defined:
```
// ReferenceError: expr is not defined
const expr = or(number, seqR(char("("), expr, char(")")));

// Works: the reference to expr is deferred
const expr = or(number, seqR(char("("), lazy(() => expr), char(")")));
```
Type Parameters
- T
Parameters
- thunk: (() => Parser<T>)
  
  a function that returns the parser
  - - (): Parser<T>
    - Returns Parser<T>
Returns Parser<T>
- a parser that evaluates the thunk on each parse attempt

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