Backport clippy fixes to active release

[alamb]

Which issue does this PR close?

Rationale:

Backports #470 / #467 to active_release (aka arrow 4.4) so I can get clean CI runs for other backported changes

Changes:

git cherry-pick  60fedf7011e15578b2f5e6fd6e3486f4e01b2ee2

And then manually resolve some conflicts

cc @jimexist

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.61111% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.69%. Comparing base (1f7f4bc) to head (9225249).

Files with missing lines	Patch %	Lines
parquet/src/arrow/array_reader.rs	57.14%	3 Missing ⚠️
arrow/src/json/reader.rs	97.56%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           active_release     #475   +/-   ##
===============================================
  Coverage           82.69%   82.69%           
===============================================
  Files                 163      163           
  Lines               44775    44762   -13     
===============================================
- Hits                37025    37017    -8     
+ Misses               7750     7745    -5     

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[jimexist]

LGTM