Fast Responses

[willscott]

Responses are often slower than they need to be, and there are a set of low-hanging work items that will make performance notably faster (we believe)

• Support partial loading of ADLs / incorporate smarter ADL node #81 is important for not doing extra unneeded work
• Support split data stores (e.g. a local car with state roots) so that api calls can be skipped on commonly needed data blocks.
• support an object cache of commonly accessed realized ipld.Node's, so that cbor decodes for these hot head requested items can be amortized.