Add IMRPhenomXO4a

Description

Creating the draft merge request to add the IMRPhenomXO4a model currently undergoing review here: https://git.ligo.org/waveforms/reviews/imrphenomxo4

API Changes and Justification

Backwards Compatible Changes

• This change does not modify any class/function/struct/type definitions in a public C header file or any Python class/function definitions
• This change adds new classes/functions/structs/types to a public C header file or Python module

Backwards Incompatible Changes

• This change modifies an existing class/function/struct/type definition in a public C header file or Python module
• This change removes an existing class/function/struct/type from a public C header file or Python module

If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.

Review Status

Review completed. For details, see https://git.ligo.org/waveforms/reviews/imrphenomxo4