refactor(rust): Move IO source metrics instrumentation to PolarsObjectStore

[nameexhaustion]

This makes it so that IO sources that use DynByteSource::ObjectStore will automatically have IO recv stats recorded (currently used by Parquet & IPC).

[codecov]

Codecov Report

❌ Patch coverage is 95.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.08%. Comparing base (8a81b0e) to head (c38646b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-io/src/cloud/polars_object_store.rs	93.75%	4 Missing ⚠️
...polars-stream/src/nodes/io_sources/ipc/metadata.rs	80.00%	1 Missing ⚠️
...eam/src/nodes/io_sources/parquet/metadata_utils.rs	80.00%	1 Missing ⚠️
...c/nodes/io_sources/parquet/row_group_data_fetch.rs	97.05%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #26414   +/-   ##
=======================================
  Coverage   81.08%   81.08%           
=======================================
  Files        1783     1783           
  Lines      243288   243275   -13     
  Branches     3074     3074           
=======================================
- Hits       197263   197256    -7     
+ Misses      45222    45216    -6     
  Partials      803      803           

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[github-actions]

The uncompressed lib size after this PR is 51.4183 MB.