feat: Complete CouchDB migration and Docker configuration

- Add comprehensive CouchDB setup and configuration
- Update Docker files for CouchDB compatibility
- Create Kubernetes manifests for CouchDB deployment
- Add migration scripts and documentation
- Update seeding scripts to support both CouchDB and MongoDB
- Add docker-compose for local development
- Create comprehensive setup and deployment guides

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

node_modules/mongodb/src/cmap/wire_protocol/shared.ts

@@ -0,0 +1,48 @@
+import { MongoInvalidArgumentError } from '../../error';
+import { ReadPreference, type ReadPreferenceLike } from '../../read_preference';
+import { ServerType } from '../../sdam/common';
+import type { Server } from '../../sdam/server';
+import type { ServerDescription } from '../../sdam/server_description';
+import type { Topology } from '../../sdam/topology';
+import { TopologyDescription } from '../../sdam/topology_description';
+import type { Connection } from '../connection';
+
+export interface ReadPreferenceOption {
+  readPreference?: ReadPreferenceLike;
+}
+
+export function getReadPreference(options?: ReadPreferenceOption): ReadPreference {
+  // Default to command version of the readPreference.
+  let readPreference = options?.readPreference ?? ReadPreference.primary;
+
+  if (typeof readPreference === 'string') {
+    readPreference = ReadPreference.fromString(readPreference);
+  }
+
+  if (!(readPreference instanceof ReadPreference)) {
+    throw new MongoInvalidArgumentError(
+      'Option "readPreference" must be a ReadPreference instance'
+    );
+  }
+
+  return readPreference;
+}
+
+export function isSharded(topologyOrServer?: Topology | Server | Connection): boolean {
+  if (topologyOrServer == null) {
+    return false;
+  }
+
+  if (topologyOrServer.description && topologyOrServer.description.type === ServerType.Mongos) {
+    return true;
+  }
+
+  // NOTE: This is incredibly inefficient, and should be removed once command construction
+  // happens based on `Server` not `Topology`.
+  if (topologyOrServer.description && topologyOrServer.description instanceof TopologyDescription) {
+    const servers: ServerDescription[] = Array.from(topologyOrServer.description.servers.values());
+    return servers.some((server: ServerDescription) => server.type === ServerType.Mongos);
+  }
+
+  return false;
+}