Added ability to get and set notification flags

[fronzbot]

Description:

Adds two new blinkpy functions:

• blinkpy.get_status() which retrieves all current notification flags and conditions
• blinkpy.set_status(data) which sets any of the notifications flags depending on the contents of data. For example, `{"low_battery": False, "motion": True} would disabled low battery notifications and enable motion notifications.

Related issue (if applicable): fixes #948

Checklist:

• Local tests with tox run successfully PR cannot be meged unless tests pass
• Changes tested locally to ensure platform still works as intended
• Tests added to verify new code works