catch coerce errors

[maxandron]

Hello,

Discovering coercion errors during safeParse would be nice. Which goes hand in hand with making the error thrown from parse a ZodError.

Example:

const maybeBigInt = z.string().pipe(z.coerce.bigint());

// works well - returns 0n
maybeBigInt.parse('0');

// Returns ZodError as expected
maybeBigInt.safeParse({});

// Throws "SyntaxError"
maybeBigInt.safeParse('not a number');

Thank you and let me know if you want me to tackle it with a PR.