New settings API for autoconfig

[avoitenko-logitech]

Description

Autocnfig (optimizer) now doesn't manipulate settings directly, instead it get and provides settings values from and to client

Motivation and Context

We have to make such transition as client will manage settings instead of back-end

How Has This Been Tested?

• Manual testing
• Unit tests

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
  Note: this change should be rolled out with appropriately updated client (which is done in neighboring repository)

Checklist:

• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.