replace at_demo_data keys with json format in atKeys file

[murali-shris]

Is your feature request related to a problem? Please describe.
Currently keys in at_demo_data are unencrypted which is different from the format in .atKeys file(encrypted using self encryption key)

Describe the solution you'd like

• create json data for demo data keys similar to .atKeys format
• create.atKeys file for demo data users so apps testing using demo atsigns can use the .atKeys file

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[ksanty]

@murali-shris is this still an active ticket? If so can you please assign a priority or close? TY!

[gkc]

It's still active. Setting to Medium