[BUG] Terminal settings types: null should be allowed as value for various fields

[naseemkullah]

*for settings at any level that can inherit from a level above

Describe the bug
The only way to clear a terminal-level terminal setting via API so that it inherits from the store-level setting is to provide null as a value.

This is my current workaround, and it works fine, but would be great to fixup the types to allow null where it can be passed to clear a setting at a terminal-level, making it inherit the store-level setting.

    // the use of `as unknown as undefined` is a workaround for a type issue in Adyen's SDK
    // `null` does in fact clear the value at the Terminal level, to then inherit the value
    // from the Store level, however the typings do not allow for `null` to be passed
    {
      gratuities: null as unknown as undefined,
      hardware: {
        restartHour: null as unknown as undefined,
        resetTotalsHour: null as unknown as undefined,
      },
      localization: null as unknown as undefined,
      nexo: null as unknown as undefined,
      payAtTable: null as unknown as undefined,
      receiptOptions: null as unknown as undefined,
      receiptPrinting: null as unknown as undefined,
      standalone: null as unknown as undefined,
    }