https://github.com/project-chip/connectedhomeip/blob/master/src/app/server-cluster/ServerClusterInterface.h#L51 currently is split into separate state restriction-wise:

• GetPath - represents a SINGLE PATH
• GetDataversion and GetClusterFlags are assumed to refer to the path in GetPath
• all the rest (Write notification, attributes, read, write, invoke, accepted commands, generated commands) take in a full path.

This asymmetry is odd - some functions look like "can handle any path" where as a few are restricted to one path.

For implementing clusters, in some cases some clusters are tightly connected and implementing them in one class could be easier. In that case it seems desirable to allow a single "cluster interface" to handle multiple paths.

Suggested changes:

• Getpath should actualy be GetPaths and return a Span<const ConcreteClusterPath>
• GetDataVersion and GetClusterFlags should take in a ConcreteClusterPath (and the path MUST be one of the GetPaths values)
• DefaultServerCluster still keeps the "one cluster implementation"