Added MutablePrimitiveArray::extend_constant

[jorgecarleitao]

That calls the internal's extend_constant

[codecov]

Codecov Report

Merging #689 (217cef3) into main (cc27dbe) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #689      +/-   ##
==========================================
+ Coverage   69.76%   69.79%   +0.02%     
==========================================
  Files         303      303              
  Lines       16829    16841      +12     
==========================================
+ Hits        11741    11754      +13     
+ Misses       5088     5087       -1     

Impacted Files	Coverage Δ
src/array/primitive/mutable.rs	84.71% <100.00%> (+0.84%)	⬆️
src/io/parquet/read/nested_utils.rs	78.43% <0.00%> (+0.98%)	⬆️

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