refactor: use DBProvider in HistoricalStateProvider

[klkvr]

Right now HistoricalStateProvider accepts both database transactions and a StaticFileProvider. StaticFileProvider is used twice: in BlockHashReader impl which is identical to the one we have for DatabaseProvider and to fetch chain tip which is identical to DatabaseProvider::last_block_number

This PR replaces tx and static_file_provider in HistoricalStateProvider with a single provider generic which is required to implement DBProvider, BlockHashReader and BlockNumReader.

The motivation here is that we'll need to add NodePrimitives generic to StaticFilesProvider and there's no need to introduce those generics to state providers.

[Rjected]

nice, this is a good simplification