remove bsddb3

[d-v-b]

We have tests that attempt to import bsddb3. I couldn't run these tests because I could not get bsddb3 to install (because the project is dead). The bsddb3 project page recommends using the berkeleydb, but I couldn't get that to install either (on my m2 mac).

It seems that, at a minimum, we should remove any attempt to import bsddb3, since it's dead. What should we replace it with, if anything?

[jakirkham]

Looking at the packaging situation, it appears there is a bsddb3 package in conda-forge, which are built for several OSes & architectures including macOS ARM. There is also discussion about adding berkeleydb to conda-forge. Don't see wheels for either

There were several of these added a while back in PR ( #186 ), which are all pretty similar

Maybe it would be worth refactoring out one class that could handle any flavor of these (maybe taking an open function to use). Then we could keep the handful that are useful / testable and then point users wanting anything else to the refactored class. WDYT?

[joshmoore]

No objections to the refactoring, though it'd suggest a deprecation cycle.

Additional option would be to extract the class. My proposal for how to start on that if someone is interested is in https://github.com/zarr-developers/cookiecutter-zarr-store

[dstansby]

See #904 (comment)