CZI Essential OSS Cycle 3

We are planning to apply to a [CZI Essential OSS Cycle 3](https://chanzuckerberg.com/rfa/essential-open-source-software-for-science/) via NumFOCUS. This issue is meant as a discussion tool with the community.

We have a tight deadline (Aug 4th), but thanks to a good handful of people, the goals are pretty well defined already:

1. Create a codec specific for n-dim data in Blosc2
2. Create interfaces for the existing Python ecosystem
3. Approach existing and new communities
4. Support new biomedical applications

We still need to isolate the tasks and create a budget. After that, we will send the application to NumFOCUS for their review. With your collaboration and a bit of luck I think we can manage to apply on-time.

@Blosc/core-devs
@scopatz

Start by reviewing the four proposed goals in this issue and the surrounding discussion to identify concrete tasks for the codec, Python interfaces, community outreach, and biomedical applications. Done means the work is broken into agreed tasks with a budget suitable for the NumFOCUS application; no repository files or tests are named.

Written by the indexing model from the issue text.