Change the proposal submission process to match ProposalDM 0.6

[pahjbo]

In ProposalDM 0.6 the submitted proposal now contains an observation configuration that ties in the instruments to the observations - this needs to be added to the GUI - see orppst/pst-api-service#52

[pahjbo]

The place where the code is needed is

pst-gui/src/main/webui/src/ProposalEditorView/proposal/Submit.tsx

Line 75 in a602245

config: [] //FIXME need to create gui to fill the obseervation->observationMode mapping.

and the model is https://ivoa.github.io/ProposalDM/generated/proposalManagement/ObservationConfiguration/ which is part of the https://ivoa.github.io/ProposalDM/generated/proposalManagement/SubmittedProposal/

[pahjbo]

and the API call is https://github.com/orppst/pst-api-service/blob/0571a876520cfb9cc43a54569c7d8846946a5d44/src/main/java/org/orph2020/pst/apiimpl/rest/SubmittedProposalResource.java#L74