Mega-refactor on `._invoke()` targeting `@context`s
Since eventually we want to implement all other RPC "func types" as contexts underneath this starts the rework to move all the other cases into a separate func not only to simplify the main `._invoke()` body but also as a reminder of the intention to do it XD Details of re-factor: - add a new `._invoke_non_context()` which just moves all the old blocks for non-context handling to a single def. - factor what was basically just the `finally:` block handler (doing all the task bookkeeping) into a new `@acm`: `_errors_relayed_via_ipc()` with that content packed into the post-`yield` (also with a `hide_tb: bool` flag added of course). * include a `debug_kbis: bool` for when needed. - since the `@context` block is the only type left in the main `_invoke()` body, de-dent it so it's more grok-able B) Obviously this patch also includes a few improvements regarding context-cancellation-semantics (for the `context` RPC case) on the callee side in order to match previous changes to the `Context` api: - always setting any ctxc as the `Context._local_error`. - using the new convenience `.maybe_raise()` topically (for now). - avoiding any previous reliance on `Context.cancelled_caught` for anything public of meaning. Further included is more logging content updates: - being pedantic in `.cancel()` msgs about whether termination is caused by error or ctxc. - optional `._invoke()` traceback hiding via a `hide_tb: bool`. - simpler log headers throughout instead leveraging new `.__repr__()` on primitives. - buncha `<= <actor-uid>` sent some message emissions. - simplified handshake statuses reporting. Other subsys api changes we need to match: - change to `Channel.transport`. - avoiding any `local_nursery: ActorNursery` waiting when the `._implicit_runtime_started` is set. And yes, lotsa more comments for #TODOs dawg.. since there's always somethin!
Tyler Goodlet
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