Replace /api/v1/entries/current with /pebble

[nielsmaerten]

• I'm submitting a ... Refactoring request

• What is the current behavior? To find someone's bloodsugar, Gluco Check queries the endpoint: /api/v1/entries/current
  If we were to replace this with a call to /pebble, we could potentially get the same information,
  while also reducing the number of API calls needed if the user has also requested IOB/COB.

• What is the motivation / use case for changing the behavior? Eliminating an API call would speed up the response time

• Other information that could help us solve this issue: Not yet sure if /pebble provides all the required info. This must be validated before switching can be considered