[Scala] Port the optional/enum template logic from async-scala to the regular scala client #4849
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PR checklist
./bin/to update Petstore sample so that CIs can verify the change. (For instance, only need to run./bin/{LANG}-petstore.shand./bin/security/{LANG}-petstore.shif updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates)2.3.0branch for breaking (non-backward compatible) changes.Description of the PR
Port the option and enum logic from the scala-async template into this one. What is considered a breaking change? This will certainly require anyone generating scala templates to update their code should they regenerate with this template, does that count as breaking? If so I'll recreate the PR onto the right branch.
I know that the plans are to merge the scala & async-scala generators, which project will be considered the main project? I initially tried using the async-scala generator and had some small issues, and switched to this generator just because it was easier to get working initially.