* test snapshots
* allow multi-scope auth
* hors-sujet: fix C compile warning
* update jwt and add hashbrown feature
* replace Auth with RequestContext
* extract RequestContext
* fix auth check for multi-scopes
* pass NamespaceName in StmtKind::Attach
* fallback to global auth if key is not set in ns config
* add allow_attach to namespace creation
* return meta store from namespace store
* test attach
* fmt
* review edits
