Add `lib.delete_batch` similar to `read_batch` and `write_batch`

[IvoDD]

Is your feature request related to a problem? Please describe. Batch deletes can be quite a lot faster than doing the deletes sequentially.

Describe the solution you'd like A lib.delete_batch which can delete a batch of symbols concurrently.

Describe alternatives you've considered delayed_deletes can make individual deletes faster but have to think about applying them later.

delete_library can delete an entire library with all it's symbols.

[IvoDD]

It would also be helpful if lib.update_batch allows updating multiple date ranges inside a single symbol.

[zeddit]

looking forward to this feature! It really helps the efficiency of daily data management.

[alexowens90]

Batch update is covered here https://github.com/man-group/ArcticDB/issues/700 Updating multiple date ranges in a single symbol would be a change to update, rather than part of a batch update API. Changing this ticket to just cover batch deletion