refactor(rust!): Update the argument name from dims to dimensions in reshape

[eitsupi]

In #8017, the reshape's argument name changed only on the Python side, so it no longer matches in Rust and in Python.

In #12288, update the error message from reshape in Rust, but used the Python argument name, making it difficult to understand. (It says reshape `dimensions` cannot be empty, but the real argument name is dims, not dimensions)
So I think it's worth unifying the argument names.

[codspeed-hq]

CodSpeed Performance Report

Merging #15561 will not alter performance

_{Comparing eitsupi:update-reshape-arg-name (08a44e0) with main (42d3697)}

Summary

✅ 22 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 81.17%. Comparing base (0a33859) to head (08a44e0).

Files	Patch %	Lines
crates/polars-core/src/series/ops/to_list.rs	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15561      +/-   ##
==========================================
+ Coverage   81.15%   81.17%   +0.02%     
==========================================
  Files        1367     1367              
  Lines      175313   175313              
  Branches     2530     2530              
==========================================
+ Hits       142269   142308      +39     
+ Misses      32566    32530      -36     
+ Partials      478      475       -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.