Split server & client and create message dispatcher object

[guseggert]

Requirements:

• Backwards-compatible interface w/ current Bitswap impl, so that this can be integrated easily and provide feedback
• Wire into Kubo
• Add configuration so can function as as just a bitswap client or bitswap server
• Passes a basic test w/ a test harness
  • It's okay for edge cases to be missing, this task is about setting up the scaffolding and feedback loop needed to complete Separable client and server implementations #564
  • Two tests
    • Private network of nodes
      • This is so we have a place to test specific scenarios
    • Peer w/ ipfs.io gateways and handle Bitswap reqs from gateways
      • So that we can test against realistic production traffic

The intention was to deploy this to a cluster to get some perf feedback, but that is looking harder than anticipated, so we should just bite the bullet and setup a proper test harness as part of this.

[BigLep]

@guseggert : what is the done criteria for this issue?

[Jorropo]

@BigLep merging #570

[BigLep]

@Jorropo and @guseggert : since this is closed, I wanted to confirm all the requirements in the issue are satisfied.

[Jorropo]

Yes it is.