* Add import order linter
Error messages aren't the most clear/helpful, but they will point you to
the lines that need modifying.
* Adjust max errors reported
* Fix lint errors
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.
* 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.
* Simple Get and Put implementations
Get implementation is currently the one that uses the kopia ID of the
model/manifest.
* Basic tests for ModelStore Get/Put
