refactor!: move the zarrs::array::{data_type,fill_value} modules into the zarrs_data_type crate

[LDeakin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.12%. Comparing base (134af54) to head (0cadcf6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
zarrs/src/array/codec/array_to_bytes/bytes.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
+ Coverage   82.08%   82.12%   +0.03%     
==========================================
  Files         173      173              
  Lines       24481    24489       +8     
==========================================
+ Hits        20095    20111      +16     
+ Misses       4386     4378       -8     

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