Rename immutable context managers to *Context

[pabloem]

Specifuically RunnerContextManager and BundleContextManager are what we need to improve.

[pabloem]

Also, make RunnerContextManager fully immutable (will also help to persist it with ray.put) to avoid the cost of passing it around ever and over.

[wilsonwang371]

let me c if i can start looking into this issue. @pabloem can you later give some help here if I take this item?

[pabloem]

I think it's fine if @flyingImer picks this up ? : )

[flyingImer]

@pabloem not sure I follow the RunnerContextManager one - not seeing any reference in the code base, am I missing anything here?

Do you mean RayRunnerExecutionContext and RayBundleContextManager ?