Add option to getFeatureFlag and isFeatureEnabled

[EDsCODE]

What does this PR do?

• getFeatureFlag and isFeatureEnabled will accept options. send_event option will toggle sending of $feature_flag_called events

Where should the reviewer start?

How should this be manually tested?

Any background context you want to provide?

What are the relevant tickets?

Screenshots or screencasts (if UI/UX change)

Questions:

• Does the docs need an update?
• Are there any security concerns?
• Do we need to update engineering / success?