fix(expr): include data type in parse error message

[xiangjinwu]

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What's changed and what's your intention?

Resolves #11059

dev=> insert into sales values (1, '{name: "Alice", paying: true, tags: ["admin"]}');
ERROR:  QueryError: Expr error: Parse error: jsonb key must be a string at line 1 column 2

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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[codecov]

Codecov Report

Merging #13121 (86f88c9) into main (23b69c4) will decrease coverage by 0.02%.
Report is 16 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #13121      +/-   ##
==========================================
- Coverage   68.22%   68.21%   -0.02%     
==========================================
  Files        1501     1501              
  Lines      252773   252777       +4     
==========================================
- Hits       172464   172425      -39     
- Misses      80309    80352      +43     

Flag	Coverage Δ
rust	68.21% <100.00%> (-0.02%)	⬇️

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Files	Coverage Δ
src/expr/impl/src/scalar/cast.rs	84.73% <100.00%> (+0.10%)	⬆️

... and 5 files with indirect coverage changes

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