Added GrowableUnion

[jorgecarleitao]

No description provided.

[codecov]

Codecov Report

Merging #902 (751a4ba) into main (31c8ec6) will decrease coverage by 0.03%.
The diff coverage is 59.61%.

@@            Coverage Diff             @@
##             main     #902      +/-   ##
==========================================
- Coverage   70.33%   70.30%   -0.04%     
==========================================
  Files         344      345       +1     
  Lines       18782    18832      +50     
==========================================
+ Hits        13210    13239      +29     
- Misses       5572     5593      +21     

Impacted Files	Coverage Δ
src/array/growable/mod.rs	18.51% <0.00%> (-1.49%)	⬇️
src/array/growable/union.rs	63.04% <63.04%> (ø)
src/array/union/mod.rs	81.08% <100.00%> (ø)

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