embedding a baseModel means that objects like backup
have a backup.StableID, but no backup.ID nor backup.
backupID. This could be confusing for users. This change
swaps the value and type names, so that baseModels
include an ID value of type StableID.
* store backup operation results in the backup manifest
Adds backup operation metadata like the outcome
statistics and selector definitions to the backup manifest
entry. These additional details will appear when users
call `corso backup list`.
* adds store package for wrapping model_store
Introduces the pkg/store package, which contains funcs
for wrapping the model_store with common requests.
This package choice was made for its combination
of being in an accessible place, centralizing functionality
and not introducing circular dependencies.
