codespace config: Update minimum host requirements and add qdrant service

[shanbady]

Description/Context

The minimum requirements for a working codespace have changed and now require atleast a 4cpu 16gb memory instance.

We need to update the codespace config so that this is the machine type launched by default (it will otherwise cause confusion when people auto-launch and the instances hangs/freezes).

We also need to add qdrant as a service in the devcontainer.json

Plan/Design

update the devcontainer.json config with minimum host requirements and include qdrant service in the runServices section