Add frontier API client lib
Add test for frontier qdata parameter
Add missing line to test
Change add function to use the batchuploader
Remove custom chunks function, it is not longer used
Change writers key to tupla of (frontier, slot)
Change 'add' function to be async, add calls to flush in unit tests
Change _writers to instance variable
Merge pull request #4 from andresp99999/frontier-api-client

Frontier api client