[Mini Apps] Add more or custom params to allow on the iframe of the twa

[chillbert]

Is your feature request related to a problem? Please describe.
I would like to set the allow params on the iframe. At the moment we have set the params for allow are the following:

allow="camera; microphone; geolocation;"
Describe the solution you'd like
Pass the params for allow and sandbox in a setting object or on the creation of the bot in botfather - other way would be add other params directly hard-coded like the three existing one mentioned on this line.

Additional context
This could help to use the full potential of web apis.