Make i18 curve fitting with ophyd-async adaptive scan - make again, encapsulating old plan into double nested plan

[stan-dot]

i18 curve fitting was tested offline with old ophyd - we need to test it with blueapi

Acceptance Criteria

The new blueapi-compatible plan is successfully ran on the beamline on non-machine day.

[stan-dot]

outline here #12 (comment)

[stan-dot]

wait we cannot write yet, this must wait it looks like

[stan-dot]

wait we could base64 encode and just send off to another service that would write that