MySQL Schema Generator

Created by: ybelenko

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• Filed the PR against the correct branch: master, 3.3.x, 4.0.x. Default: master.
• Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

Description of the PR

I'm happy to finally represent first version of MySQL schema generator. 🎆 Current version is beta, but I need feedback from community asap. Related discussion about data mapping #955 (closed)

How to refresh samples

$ ./bin/mysql-schema-server-petstore.sh

What else I gonna do

• Add defaultDatabaseName cli option
• Reconsider every mustache variable, to avoid spelling overhead (eg. mysqlSchemaColumnDataTypeDefinition)
• Fix DEFAULT statements generation
• Add cli option jsonDataTypeEnabled which true by default. When it's disabled, all object and array data maps to TEXT data type
• Add test spec file which covers all edge cases of current generator

cc @OpenAPITools/generator-core-team

@wing328 If you think it's appropriate to notify somebody beside core team members to this thread, please do that in a next comment