refactor(rust): Add capability to transmute to SharedStorage

[orlp]

This will come in handy in the future, this lets us safely transmute between SharedStorages.

[codecov]

Codecov Report

Attention: Patch coverage is 57.50000% with 34 lines in your changes missing coverage. Please review.

Project coverage is 80.19%. Comparing base (8a76dad) to head (3013b36).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-arrow/src/storage.rs	57.50%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19353      +/-   ##
==========================================
- Coverage   80.24%   80.19%   -0.05%     
==========================================
  Files        1523     1523              
  Lines      209545   209853     +308     
  Branches     2434     2434              
==========================================
+ Hits       168148   168299     +151     
- Misses      40842    40999     +157     
  Partials      555      555              

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