Change the signature of `Container.serialize` and
`Container.deserialize` to use `Buffer` instead of `bytes`, as this
makes the functions compatible with the `revng::pypeline::Buffer`
classes.
The `serialize` function of `revng::pypeline::Model` erroneously
returned a buffer instead of `bytes`, fix the function so that `bytes`
are returned instead.
When click calls the command handler functions, dashes are converted to
underscores to work with the variable name limitations of python. When
accessing kwargs, convert the argument name to the underscored version.
When calling `StorageProvider.invalidate`, return a dictionary that
conveys to the caller which objects were deleted from storage as a
consequence of the paths supplied to the `invalidate` call.
Fix the invalidation logic in both `InMemoryStorageProvider` and
`Sqlite3StorageProvider`, as it did not account for propagating the
invalidation to both children objects and parent objects.
The column stored read model paths was erroneously called
`model_path_hash`, while the entire model was stored instead of a hash.
Rename the column to just `model_path` to avoid any confusion.
Giacomo Vercesi