Add "static-context" paradigm OFEP

[toddbaert]

As discussed in the 22nd community meeting, this draft outlines a new "static-context" paradigm to better support client/web use-cases.

The key changes in this paradigm are:

• the lack a context parameter on evaluation methods
• the lack of a context setter on the client class
• a optional method in providers that is called when the global context is changed, which the provider can use to "reconcile" it's context

For more information, please see the OFEP.

I believe this, combined with disposal and events, represent the basis for proper client support in the spec.

[github-actions[bot]]

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