fix(sequelize): parse JSON columns to objects for mysql dialect

[KalleV]

By parsing the values to JSON objects, provide backward compatibility for JSON and Array entity properties when using dialects like MySQL, MariaDB, or SQLite.

Fixes: #9629 Fixes: #9598

Checklist

• [x] DCO (Developer Certificate of Origin) signed in all commits
• [x] npm test passes on your machine
• [x] New tests added or existing tests modified to cover all changes
• [ ] Code conforms with the style guide
• [ ] API Documentation in code was updated
• [ ] Documentation in /docs/site was updated
• [ ] Affected artifact templates in packages/cli were updated
• [ ] Affected example projects in examples/* were updated

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[coveralls]

Pull Request Test Coverage Report for Build 8590810023

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 55.371%

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Totals
Change from base Build 8564057942:	0.0%
Covered Lines:	9563
Relevant Lines:	12457

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💛 - Coveralls

[samarpanB]

@KalleV This PR is good to be merged now. Can you please rebase this PR ?

[KalleV]

@samarpanB Thanks! I fixed the rebase merge conflicts.