[Story] Correct handling of FOpts parameter for all supported regions

[MaggieSalak]

Description

FOpts is applicable to majority of regions but currently it's not explicitly handled in our implementation for the payload calculation. There are two different max values depending on whether this Fopts is present or not.

from the regional parameters

Acceptance criteria

• [ ] Investigate whether we need to use this optional param
• [ ] Surface the param in region implementation
• [ ] Use the value to compute values depending of it, e.g. Max payload size depending on the region

[roel4ez]

@mandur can we find a parent for this?

[Mandur]

We did put it under china