* `ValueAggregate` refactoring
0. Service results, canon results and literals are constructed as
separate types that are further wrapped with `ValueAggregate`.
1. `ValueAggregate` is enum that contains all the provenance info.
2. Construction methods get provenance information as well.
* Rename CID state field
Prepare to adding a canon CID field: rename `canon_tracker`/`canon_store`
to `canon_element_tracker`/`canon_element_store`.
* Add canon result store/tracker
* Rename some structs that have CIDs inside
Reflect explicitly that they contain CIDs inside:
`CanonResultAggregate` -> `CanonResultCidAggregate`
`ServiceResultAggregate` -> `ServiceResultCidAggregate`
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Co-authored-by: Mike Voronov <michail.vms@gmail.com>
