Made JSON encoder a public function#443

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Commits on Dec 8, 2022

Made JSON encoder a public function
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Commits on Dec 9, 2022

Added public Decode functionality to a Starlark value
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Removed some auto-indentions that were accidentally committed
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Improved name of JSON encoding function and changed its return value to a byte slice
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Commits on Dec 10, 2022

Fixing improper bytes/string conversion; Updating comments
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