Sound serialize not serialising url

[Subrat_Gupta]

• Bug repro on playground:Babylon.js Playground
• Expected result: During serializing Sound , give url and name should be serialized
• Current result: for both url and name , name is getting serialized

Screenshots

because of when serializing to .babylon and parsing back sounds are not getting stored

[Subrat_Gupta]

have opened a PR for this [BUG] #14203 fix:Sound serialize by SubratGuptaCtruh · Pull Request #14204 · BabylonJS/Babylon.js · GitHub

[sebavan]

cc @docEdub to validate the best way of serializing.