[legacy-framework] Fixes field names being modified during model generation

[toshi1127]

This PR closes the issue of Prevent automatic conversion of field names. blitz-js/legacy-framework#923

What are the changes and their implications?

• Prevent automatic conversion of field names.

Checklist

• Tests added for changes
• PR submitted to blitzjs.com for any user facing changes

[toshi1127]

Should I fix the list so that it doesn't also auto-convert to plural form?

  it("pluralizes lists and makes single fields singular", () => {
    expect(Field.parse("userIds:string[]").toString()).toEqual(
      Field.parse("userId:string[]").toString(),
    )
  })

[aem]

@toshi1127 yeah that would be great! Thanks so much for tackling this

[toshi1127]

Prevent field name from being converted to plural forms when creating a Field with a list type property.

[toshi1127]

Prevent automatic conversion of field name when creating a Field with relationships, such as hasOne.

[flybayer]

@aem this is ready for final review