Endpoint Builder Interface
interface EndpointBuilderInterface
A mutable handle to an endpoint builder, handed to `Preset::apply`.
Mirrors the chainable surface of iroh::endpoint::Builder that a preset cares about. The three apply_* methods replay the corresponding upstream iroh::endpoint::presets impl (which, importantly, install the crypto provider) — a custom preset will almost always call one of them as a baseline before layering its own configuration.