Add a configurable error boundary to the fetcher

[SferaDev]

{ type: "throw" } | { type: "retry"; retries: number; wait: number | (retry: number) => number } | { type: "custom"; boundary: (method, route, ..., retry()) => void }

Retry strategy only applies to get operations.

[richardgill]

@SferaDev is this something we've already done? If not is it a P2?