feature : Replaced Google maps with open street maps

[apoorva-raj]

Fixes #2302

Changes:
Removed Google Maps from the playstore build and deleted associated files. Instead, added the OpenStreetMaps implementation in the default build.

Checklist:

• I have used resources from strings.xml, dimens.xml and colors.xml without hard-coding any value.
• No modifications done at the end of resource files strings.xml, dimens.xml or colors.xml.
• I have reformatted code and fixed indentation in every file included in this pull request
• My code does not contain any extra lines or extra spaces.
• I have requested reviews from maintainers.