Blosc1 gpu

[nclack]

closes #2

Adds blosc-zstd and blosc-lz4 decoding on the gpu. Supports the various bit/byte shuffle things.

Uses nvcomp for the raw lz4/zstd parts.

Allows for mixed sources - a batch can draw samples from zarrs with different encodings. supporting zstd, blosc-lz4, blosc-zstd, and none for now.

Not really optimized yet.

There's a d2h early in the pipeline and a sync point that's required for getting parameters for the nvcomp launch. The blosc kernels themselves probably need an optimization pass too. I did some basic checking on register pressure etc, but more to do there.

[codecov]

Codecov Report

❌ Patch coverage is 54.22343% with 168 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.91%. Comparing base (81b0bed) to head (c321ace).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/damacy.c	53.81%	46 Missing and 69 partials ⚠️
src/decoder/decoder_lz4.c	53.06%	7 Missing and 16 partials ⚠️
src/decoder/decoder_zstd.c	53.06%	5 Missing and 18 partials ⚠️
bench/main.c	0.00%	4 Missing ⚠️
src/zarr/zarr_metadata.c	78.57%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   40.80%   41.91%   +1.11%     
==========================================
  Files          28       29       +1     
  Lines        4220     4454     +234     
  Branches     1008     1081      +73     
==========================================
+ Hits         1722     1867     +145     
- Misses       1995     2028      +33     
- Partials      503      559      +56     

Flag	Coverage Δ
unittests	41.91% <54.22%> (+1.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/planner/planner.c	68.96% <100.00%> (+0.80%)	⬆️
src/zarr/zarr_metadata.c	49.61% <78.57%> (+10.30%)	⬆️
bench/main.c	0.00% <0.00%> (ø)
src/decoder/decoder_lz4.c	53.06% <53.06%> (ø)
src/decoder/decoder_zstd.c	53.06% <53.06%> (ø)
src/damacy.c	59.25% <53.81%> (-0.65%)	⬇️

... and 1 file with indirect coverage changes

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