Data Engineers should be able to submit proposals

[tse-lao]

• We need engineers to be able to submit their proposals in Polybase.

Record(id, bountyId, proposalCID <- all the details of his program, name?, instructions?, startCommand, endCommand, numOfInputs)

• Need to able to edit their proposals
• Engineers need to add multi proposals.
• Specify implementation program: python, wasm etc.