Remove scopedenum for EnumX

[quinnj]

Successor to #309

[codecov-commenter]

Codecov Report

Merging #444 (fd24b41) into main (3008e7f) will increase coverage by 4.27%.
The diff coverage is 80.64%.

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
+ Coverage   82.98%   87.25%   +4.27%     
==========================================
  Files          25       26       +1     
  Lines        3214     3209       -5     
==========================================
+ Hits         2667     2800     +133     
+ Misses        547      409     -138     

Impacted Files	Coverage Δ
src/metadata/Flatbuf.jl	100.00% <ø> (ø)
src/metadata/File.jl	30.61% <33.33%> (ø)
src/eltypes.jl	86.05% <62.06%> (+1.02%)	⬆️
src/metadata/Message.jl	77.68% <62.50%> (+5.78%)	⬆️
src/metadata/Schema.jl	83.75% <91.66%> (+3.92%)	⬆️
src/FlatBuffers/FlatBuffers.jl	93.33% <100.00%> (+29.69%)	⬆️
src/arraytypes/arraytypes.jl	89.62% <100.00%> (+3.77%)	⬆️
src/arraytypes/bool.jl	88.70% <100.00%> (+3.22%)	⬆️
src/arraytypes/compressed.jl	100.00% <100.00%> (+9.30%)	⬆️
src/arraytypes/dictencoding.jl	75.58% <100.00%> (+2.32%)	⬆️
... and 8 more

... and 5 files with indirect coverage changes

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