Add consolidated metadata support

[LDeakin]

• Pending Added consolidated metadata to spec zarr-developers/zarr-specs#309
• Use consolidated metadata as intended when opening a Node to reduce requests
• Changelog
• Zarr V2 consolidated metadata support?

[codecov]

Codecov Report

Attention: Patch coverage is 98.01980% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.26%. Comparing base (10d3b80) to head (fc50898).

Files with missing lines	Patch %	Lines
zarrs/src/group.rs	92.30%	1 Missing ⚠️
zarrs/src/node.rs	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   83.16%   83.26%   +0.09%     
==========================================
  Files         162      162              
  Lines       22463    22563     +100     
==========================================
+ Hits        18681    18786     +105     
+ Misses       3782     3777       -5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.