Alessandro/flatten mounts into host reducerid list [Namespaces Part 5]

[aasoni]

Description of Changes

• For all module mounts in a module generate reducer ids for each of the module's reducers by "flattening" the mounts recursively.

For a root module with reducers [A, B], mount "auth" with reducers [C] and submount "baz" with reducers [D]:

ReducerId	Reducer
0	A
1	B
2	C (auth)
3	D (auth/baz)

• Resolve reducer names containing namespaces (e.g. auth/C) to the appropriate reducer id

API and ABI breaking changes

Expected complexity level and risk

Testing