Add returnFieldsByFieldId parameter

[robbieaverill]

Replaces #157, including some docs and tests.

Adds support for returnFieldsByFieldId Airtable parameter, which instructs the Airtable API to return field IDs rather than names. It is recommended to use this option when possible:

Field names and field ids can be used interchangeably. Using field ids means field name changes do not require modifications to your API request. We recommend using field ids over field names where possible, to reduce modifications to your API request if the user changes the field name later.

[robbieaverill]

cc @gtalarico

[robbieaverill]

Thanks

[robbieaverill]

Hey @gtalarico, any chance of a tag, even a beta?

[gtalarico]

Released 1.2.0 @robbieaverill !

[gtalarico]

Sorry for the delay.

[robbieaverill]

No problem. Thank you!