List of Garbage Low Hanging fruits

[Jorropo]

Is what you see when you do an allocation profile of kubo when under load (ipfs add & ipfs get & gateway).

The goal is to reduce CPU usage by running GC less often, reduce stop the world events (and cooperative preamptions) and finaly give better latency.

This is a collection of smallish refactors that we should fix :

• valuify blocks.Block go-block-format#45
• multiaddr.Protocols, adding a multiaddr.AppendProtocols (and using it), woud allow to reuse slice capacity: perf: Add AppendProtocols for a an allocation free to get the protocols multiformats/go-multiaddr#188
• perf: outline logic in Decode to allow for stack allocations multiformats/go-multihash#174
• perf: add a generic CID type which allows for aliased byte slices go-cid#159