impr(logger): add _log func to control console logging with debug flag

[joeldarling]

impr(logger): add _log func to control console logging with debug flag

Description

Adds _log function and debug flag, so end-users can turn app logging on or off.

https://aircall.atlassian.net/browse/ECO-76

Submission

• [x] Your branch is based on master
• [x] Your code is unit tested
• [ ] CircleCI builds are green (coverage and lint)
• [x] Add team "CTI" as "Reviewer" for the PR
• [x] Name your PR with the convention fix|feat|impr(<subject>): description.

[hereismass-bot]

The code coverage of this PR is 99.21% :white_check_mark: Coverage for master is 99.17%.

[hereismass-bot]

The code coverage of this PR is 99.21% :white_check_mark: Coverage for master is 99.17%.