casting kernel can combine multi-match patterns

[jimexist]

Which issue does this PR close?

Depends on #591

Rationale for this change

to simplify code, reduce duplication

What changes are included in this PR?

Are there any user-facing changes?

[codecov-commenter]

Codecov Report

Merging #883 (7513eca) into master (f4fdc9c) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #883      +/-   ##
==========================================
+ Coverage   82.29%   82.31%   +0.02%     
==========================================
  Files         168      168              
  Lines       48122    48031      -91     
==========================================
- Hits        39600    39535      -65     
+ Misses       8522     8496      -26     

Impacted Files	Coverage Δ
arrow/src/compute/kernels/cast.rs	94.81% <100.00%> (+0.34%)	⬆️
parquet/src/encodings/encoding.rs	93.52% <0.00%> (-0.20%)	⬇️
parquet_derive/src/parquet_field.rs	66.43% <0.00%> (+0.22%)	⬆️
arrow/src/array/transform/mod.rs	85.47% <0.00%> (+0.27%)	⬆️
arrow/src/datatypes/datatype.rs	65.36% <0.00%> (+0.43%)	⬆️
arrow/src/array/data.rs	74.93% <0.00%> (+0.81%)	⬆️
arrow/src/array/array.rs	85.71% <0.00%> (+2.67%)	⬆️

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[alamb]

not backporting as it needs newer rust edition