Return faker.helpers.fromRegExp() for strings where string pattern is provided

[tmiddlehurst]

Extend transform string logic to return faker's fromRegExp() if a regexp pattern is provided, e.g.

percent_change:
    type: string
    pattern: '/[0-9]{2}.[0-9]{2}/'
email_address:
    type: string
    pattern: '/[a-z]{5,15}@springfieldnuclear.org/'

Useful for cases where you want to return a random stringified number within certain parameters, e.g.

faker.helpers.fromRegExp(/[0-9]{2}.[0-9]{2}/)                  // "55.11"
faker.helpers.fromRegExp(/[a-z]{5,15}@springfieldnuclear.org/) // homerjsimpson@springfieldnuclear.org  

https://fakerjs.dev/api/helpers#fromregexp