Codec partial encoders

[LDeakin]

This is mainly to support incremental writing of large shards similar to the encoding procedure outlined in the sharding specification.

Addresses LDeakin/zarrs_tools#9.

[codecov]

Codecov Report

Attention: Patch coverage is 86.03043% with 101 lines in your changes missing coverage. Please review.

Project coverage is 83.29%. Comparing base (10d3b80) to head (67052f3).

Files with missing lines	Patch %	Lines
...array/codec/bytes_partial_encoder_default_async.rs	77.94%	15 Missing ⚠️
.../array/codec/bytes_partial_encoder_default_sync.rs	77.61%	15 Missing ⚠️
...s/src/array/codec/storage_partial_encoder_async.rs	74.19%	8 Missing ⚠️
...rs/src/array/codec/storage_partial_encoder_sync.rs	77.77%	8 Missing ⚠️
zarrs/src/array/array_async_readable_writable.rs	83.33%	7 Missing ⚠️
zarrs/src/array/array_sync_readable_writable.rs	85.36%	6 Missing ⚠️
...array/codec/array_partial_encoder_default_async.rs	92.98%	4 Missing ⚠️
...ec/array_to_array_partial_encoder_default_async.rs	92.45%	4 Missing ⚠️
...dec/array_to_array_partial_encoder_default_sync.rs	92.98%	4 Missing ⚠️
.../array/codec/array_partial_encoder_default_sync.rs	95.08%	3 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   83.16%   83.29%   +0.12%     
==========================================
  Files         162      170       +8     
  Lines       22463    23161     +698     
==========================================
+ Hits        18681    19291     +610     
- Misses       3782     3870      +88     

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