refactor(rust): Rename MetaData -> Metadata

[nameexhaustion]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.59184% with 10 lines in your changes missing coverage. Please review.

Project coverage is 79.93%. Comparing base (76a340b) to head (79c3f08).
Report is 49 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-stream/src/nodes/parquet_source.rs	0.00%	4 Missing ⚠️
crates/polars-parquet/src/parquet/write/stream.rs	0.00%	2 Missing ⚠️
crates/polars-parquet/src/arrow/read/mod.rs	50.00%	1 Missing ⚠️
crates/polars-parquet/src/arrow/write/file.rs	0.00%	1 Missing ⚠️
crates/polars-parquet/src/parquet/read/stream.rs	0.00%	1 Missing ⚠️
crates/polars-parquet/src/parquet/write/file.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18644   +/-   ##
=======================================
  Coverage   79.92%   79.93%           
=======================================
  Files        1506     1506           
  Lines      203031   203031           
  Branches     2891     2891           
=======================================
+ Hits       162280   162294   +14     
+ Misses      40201    40187   -14     
  Partials      550      550           

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