This patch changes separates the business logic of fetching from the process of
fetching itself. It does this through a sans-IO approach, where a `Fetcher`
provides the necessary state to help drive a fetch forward, without performing
any of the IO itself.
What the `Fetcher` cares about is:
- What nodes are going to be attempted to be fetched from
- In what order should they be attempted
- When should the fetching process be considered finished
The `Fetcher` is then used in `radicle-cli` to drive forward the `sync::fetch`
function, allowing it to only care about the IO.
Gives the same options to `rad seed` as `rad sync --fetch`.
Allows seeding and syncing from specific seeds in one command:
rad seed <rid> --from <nid>
Useful for seeding private repos on public nodes.
* Remove `rad sync --force` flag
* Remove `rad clone --private` flag
These flags are no longer necessary. Simplify specifying which seed
to fetch from with `--seed` is enough.
When `--private` is passed to `clone`, we force a fetch from nodes that
aren't known seeds.
When it isn't specified, we skip nodes that aren't known seeds, even if
they are in the preferred seeds list. Previously, we would still fetch
from them, which would cause errors.
We were using the two pretty interchangeably. "Project" should only be
used to refer to the repository payload. "Repository" should be used
when referring to the resource that is fetched, synced, cloned, checked
out etc.