cleanup / rename service message channels

[noot]

Expected Behavior

• it would be preferred to rename basic network message channels to in, out instead of msgRec, msgSend
• also, need to determine if we want to change the names of other channels that aren't for network messages to be similar to this eg. core blkRec to blockOut or something along those lines

Current Behavior

• no standard naming for message channels

Checklist

• [x] I have read CODE_OF_CONDUCT and CONTRIBUTING
• [x] I have provided as much information as possible and necessary
• [ ] I am planning to submit a pull request to fix this issue myself

[noot]

after some thought, I have realized that channels for inter-process messaging isn't needed, unless it's needed to "push" some data eg. a subscription. the channels between core, babe, and network might be overkill and removable if instead the services interact through interfaces. needs exploration

[noot]

closing since #1063 covers this