[#8] Add proper exception handling

[Viicos]

Closes #9

[Viicos]

@CharString, from what I remember when we talked about this:

• it would be great to have two kinds of exceptions being raised: one when we have invalid json logic, the other one when the actual expected inferred type doesn't match. Any idea how we could distinguish both? I currently have only one exception for all possible errors.

In the form builder, I have the following validation snippet:

try {
  builderContext.validateLogic(val, [['', '']]);
} catch (error) {
  if (error instanceof InferenceError) {
    ctx.addIssue({
      code: z.ZodIssueCode.custom,
      message: error.message,
    });
  } else {
    ctx.addIssue({
      code: z.ZodIssueCode.custom,
      message: `Something went wrong when validating items expression: ${error.message}`,
    });
  }
}

I do have unexpected exceptions when using what looks like invalid json logic:

[Viicos]

I will merge this, #9 (comment) can be sorted out later