Add donation button using google play balance

[gturi]

Checklist

• [X] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [X] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [X] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [X] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the contribution guidelines.
• [X] I optionally donated to support the Fossify mission.

Feature description

It would be nice to have a button for donating using google play balance.

Why do you want this feature?

Sometimes I have spare google play balance I earned through google opinion rewards surveys. It would be nice to have the possibility to use that to support the developers.

Additional information

No response

[naveensingh]

See https://github.com/FossifyOrg/Gallery/discussions/6#discussioncomment-7928256