Use dimension separator in arrays instead of FSStore

[sanath-2024]

Move all usage of dimension_separator from Zarr stores to individual Zarr arrays, in order to avoid .zmetadata dimension separator bug

[tasansal]

Thanks @sanath-2024. I will run some cloud ingestion tests and then merge if everything works as expected.

This PR is related to #43

[srib]

Closes #42

[codecov-commenter]

Codecov Report

Merging #52 (bde1944) into main (6f0372c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   80.85%   80.85%           
=======================================
  Files          43       43           
  Lines        1583     1583           
  Branches      203      203           
=======================================
  Hits         1280     1280           
  Misses        267      267           
  Partials       36       36           

Impacted Files	Coverage Δ
src/mdio/api/io_utils.py	61.53% <ø> (ø)
src/mdio/converters/segy.py	76.56% <ø> (ø)
src/mdio/segy/blocked_io.py	90.16% <ø> (ø)
tests/unit/conftest.py	100.00% <100.00%> (ø)

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[tasansal]

thanks @sanath-2024