[ENHANCEMENT] Add Optimizely OpenFeature providers

[liran2000]

Description

Hi,

This issue is for opening OpenFeature providers, starting with the following:

• Go provider - planned.
• Java provider - opened PR.

@jaeopt @muzahidul-opti @Mat001 can you please add your review to the PR ?

thanks

Benefits

OpenFeature is an open specification that provides a vendor-agnostic, community-driven API for feature flagging that works with your favorite feature flag management tool or in-house solution.

Standardizing feature flags unifies tools and vendors behind a common interface.
It provides a framework for building extensions and integrations that can be shared across the community.

Detail

Readme describes the provider.