Support minLength and maxLength for stringMatching

[TomerAberbach]

🚀 Feature Request

stringMatching generates based on the regular expression, but doesn't provide a way to set a min or max length on the generated strings.

Motivation

Sometimes you want to test specific lengths of a string matching a regex, but modifying a regular expression to have a specific min and/or max length can be pretty hard and confusing. It would be a lot easier to just be able to pass minLength and maxLength like the string arbitrary.

Example

const nameRegex = /^[a-z]+$/

// Test different lengths without having to modify regex
fc.stringMatching(nameRegex, { minLength: 10 })
fc.stringMatching(nameRegex, { maxLength: 10 })
fc.stringMatching(nameRegex, { minLength: 5, maxLength: 10 })