add close, resolve and get proposal

index.ts

src/features/proposal/closeProposal.ts

src/features/proposal/resolveProposal.ts

src/features/proposal/showProposals.ts

src/handlers/proposal/proposalHandlers.ts

src/handlers/roleHandlers.ts

src/services/proposal.service.ts

src/utils/getRole.ts

test/handlers/roleHandlers.spec.ts