Rework `SUPERVISOR_COMMS.send_request` class/method to have `log` stored as a attribute

[kaxil]

 This reminds me: we should rework this class/method to have `log` stored as a attribute so we don't need to pass log in to this class.

(Future work; doing this will make it easier to use this from within XCom or Variable class.)

Originally posted by @ashb in #44590 (comment)

[Prab-27]

@amoghrajesh I'd like to participate to understand how this dependency separation is done.

If it’s okay, can I work on this issue?

[amoghrajesh]

Feel free, right now we have to init a log and pass it around functions in task_runner etc, it would be better if we could have simpler API / functions without need to pass them around.

Assigning it to you, let us know if you have qns.