Move all metadata/configuration structures into the metadata module

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.92192% with 187 lines in your changes missing coverage. Please review.

Project coverage is 81.65%. Comparing base (3f94ab1) to head (04c511e).

Files	Patch %	Lines
src/metadata/v3/codec/pcodec.rs	74.21%	33 Missing :warning:
src/metadata/v3/metadata.rs	88.15%	18 Missing :warning:
src/metadata/v3/chunk_grid/regular.rs	5.88%	16 Missing :warning:
src/metadata/v3/codec/bz2.rs	68.00%	16 Missing :warning:
...rc/array/chunk_key_encoding/chunk_key_separator.rs	42.30%	15 Missing :warning:
...rc/array/codec/bytes_to_bytes/blosc/blosc_codec.rs	61.11%	14 Missing :warning:
src/metadata/v3/chunk_grid/rectangular.rs	47.36%	10 Missing :warning:
src/metadata/v3/codec/blosc.rs	60.00%	10 Missing :warning:
...ay/codec/array_to_array/bitround/bitround_codec.rs	0.00%	5 Missing :warning:
src/array/chunk_key_encoding/v2.rs	20.00%	4 Missing :warning:
... and 26 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ========================================== - Coverage 81.74% 81.65% -0.09% ========================================== Files 129 136 +7 Lines 19327 19349 +22 ========================================== + Hits 15798 15799 +1 - Misses 3529 3550 +21 ```

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