suggest close issues in `zarr-python`

[sanketverma1704]

Linking this from #54. There are issues in zarr-python, which are generally questions/queries around 'How to do X with Zarr?', feature requests, or no longer valid because the recent updates render the issue obsolete. Here are my suggestions for issues which can be closed:

• Feature Request: Advanced indexing without oindex and vindex zarr-python#926 - Issue closed
• zarr validation and consistency checking zarr-python#912 - enhancement label added
• copy string arrays zarr-python#887 - Issue closed

If you think this is in the right category, feel free to assign the label or comment here, and I'll add the label to the issue. Thanks!

[joshmoore]

I removed zarr-developers/zarr-python#912 since I believe it could still end up being a feature. There may be other similar issues that could be combined into one though.

Edit: after discussion, moved "Zarr validation" to enhancement.

[joshmoore]

I'd propose that zarr-developers/zarr-python#809 could call under "needs verifying"

[sanketverma1704]

I'd propose that zarr-developers/zarr-python#809 could call under "needs verifying"

Thanks for reviewing, @joshmoore.
Adding zarr-developers/zarr-python#809 under #57.