Serialize lists to comma delimited string in PaymentAccount.toJson() instead of PaymentAccount.toForm() [0.2 XMR]

[woodser]

This issue requests serializing lists to a comma delimited string in PaymentAccount.toJson() instead of PaymentAccount.toForm().

The implementation should be in PaymentAccountTypeAdapter?

[github-actions]

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[abhishek818]

Will take an attempt at this.

[niyid]

This requirement seems to be unclear.

[fxrstor]

@woodser As the PR is merged, this issue should be closed as completed, right?