feat: harden support for any file-like (including fsspec file handles). cast urls to fsspec

[tlambert03]

closes #290

This implements the full test suite I needed to see over in #290, and exposed a number of additional issues that needed to be addressed. Ultimately, nd2 was already very close to being able to support any arbitrary file-like, including any fsspec abstract file handle ... which is an even more general case of casting the user's s3:// string for them. So this implements that full support, but also casts strings for the user. We add a new storage_options: dict parameter to ND2File, since now the user will have to be able to modify things like client_kwargs and config_kwargs). Most of the diff here is related to typing (hardening the assumptions about accepting and Read/Seek Binary stream). and then there is also the read_plane fallback when we don't have a memmap, same as in #290

what this doesn't have is any additional public api around parallel_read_plane. If I'm not mistaken, all of that could just as easily be accomplished by the end user by creating their own executor and batch calling the existing read_plane in a loop. Since it's still likely to be much less common usage, I'd prefer to just ask the end-user to do their own parallelization rather than add complexity (and assumptions) for a possibly rarely used feature.

[codspeed-hq]

Merging this PR will not alter performance

✅ 13 untouched benchmarks

---

_{Comparing remote (1dd2e46) with main (cfc95b6)}

[codecov]

Codecov Report

❌ Patch coverage is 89.51613% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.47%. Comparing base (cfc95b6) to head (1dd2e46).

Files with missing lines	Patch %	Lines
src/nd2/_readers/protocol.py	83.33%	8 Missing ⚠️
src/nd2/_parse/_chunk_decode.py	89.47%	2 Missing ⚠️
src/nd2/_readers/_modern/modern_reader.py	88.88%	2 Missing ⚠️
src/nd2/_nd2file.py	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
- Coverage   93.65%   93.47%   -0.18%     
==========================================
  Files          22       22              
  Lines        2630     2697      +67     
==========================================
+ Hits         2463     2521      +58     
- Misses        167      176       +9     

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[tlambert03]

@derekthirstrup

please let me know if this works for you. It meets all the tests I want it to meet here (see test_s3.py).

as mentioned above, I haven't extended the public api with read_plane_parallel, but that should be easy enough for you to do directly wherever you are using read_plane with your own executor