[feature]: Consider adding configuration parameters for actor channels

[Erigara]

          These (actor channel capacities) should be config params at some point. 
          
          Consider adding them (with defaults) to the `p2p` config proxy. 

Originally posted by @appetrosyan in #3346 (comment)

Currently all bounded channels of iroha have capacity of 1, without observed performance penalties. Additional benefit of smallest possible capacity is that we will find out about any communication problems sooner than later.
We should discus and consider addition of configuration params to change capacity of actor channels.

[mversic]

not relevant anymore