chore(docs): update docs with new orchestrator pattern using DurableAgent. Add deprecation notice for former orchestrators#5030

CasperGN wants to merge 2 commits intodapr:v1.16dapr/docs:v1.16from

CasperGN:docs/dapr-agents-orchestratorCasperGN/docs:docs/dapr-agents-orchestratorCopy head branch name to clipboard