feat: added handling for date in createFormData

[TheYoxy]

Description

As is, when serializing a date as JSON, it add annoying quotes in the output, which leads to error when coupling with zod.

const date = new Date(2023, 1, 1);
console.log(JSON.stringify(date), date.toISOString(), JSON.stringify(date) === date.toISOString());
// "2023-01-31T23:00:00.000Z" 2023-01-31T23:00:00.000Z false

I've added a case when not "stringify" form data while using createFormData method to use the toISOString() method instead of the JSON.stringify.

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

All the tests has been added inside the pr to match the issue encountered.

• [x] Unit tests

Checklist:

• [x] My code follows the guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings or errors
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[AlemTuzlak]

@TheYoxy thank you for this, wondering if this could potentially break anything for existing implementations, I'd assume not

[TheYoxy]

I'd assume not too, as I feel that it causes more problems to keep in this state and the user should patch it if it ever want to keep the date object instead of getting the string value.