Add is_por_holder field in club and council, and latitude, longitude in workshops endpoint

[krashish8]

Fixes #33

The issue of adding is_por_holder field went noticed, So, this PR resolves that.

[krashish8]

Also adding latitude and longitude options in workshops, along with the location option. So, hereby, location will signify a text-like verbose location, and the latitude and longitude will signify the coordinates of that location.

[krashish8]

@nishantkr18 @nishantwrp

Note the format of the coordinates (latitude and longitude):

• The total number of digits before the Decimal Point must be at max 3.
• The maximum number of decimal places shall be 6. Each .000001 difference in coordinate decimal degree is approximately 10 cm in length, so adding more decimal places would be meaningless.
• Therefore, ensure that there are no more than 9 digits in total. (3 + 6)
• In case the coordinates aren't specified for the workshop, either send a none value with the respective key or don't send the coordinate field in the JSON data.
• So, the max and min coordinate represented can be 999.999999 and -999.999999. Of course, these coordinate do not exist in real world, but I haven't added any validation for that.