Use static-typed equal functions directly

[yjhmelody]

I am not sure if this will improve performance and affect API semantics?

[codecov]

Codecov Report

Merging #507 (68fe724) into main (9163616) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #507   +/-   ##
=======================================
  Coverage   80.18%   80.18%           
=======================================
  Files         381      381           
  Lines       23659    23659           
=======================================
+ Hits        18970    18971    +1     
+ Misses       4689     4688    -1     

Impacted Files	Coverage Δ
src/array/equal/mod.rs	90.32% <100.00%> (ø)
src/io/avro/read/schema.rs	55.95% <0.00%> (+1.19%)	⬆️

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[jorgecarleitao]

Simpler is better :)