Max_block and batch_size handling

[dwest77a]

• Add the options max_block and batch_size as optional parameters to pyfive.File and associated functions/methods to enable the use of both these variables in the backend _read_bulk_fsspec method. If max_block is not None, the fsspec merge_range_requests utility function can then be used.

[dwest77a]

@valeriupredoi there is currently an issue with the mypy pre-commit stage on the pull request around specific class attributes posix and _fh in ChunkRead which are defined only in the child class DatasetID. This is not something I've changed, do you have a fix for this on main, or do you know why it is being highlighted in my version but not main?

[valeriupredoi]

@valeriupredoi there is currently an issue with the mypy pre-commit stage on the pull request around specific class attributes posix and _fh in ChunkRead which are defined only in the child class DatasetID. This is not something I've changed, do you have a fix for this on main, or do you know why it is being highlighted in my version but not main?

I'll have a look, Dan 🍺