feat: Use BlobFormat and properly support adding raw blobs

[Frando]

Description

With #1496 we also got a BlobFormat in more parts of the code base. This extends this to the CLI, bringing with it a few features:

• Stricter types about adding STDIN vs files
• Support adding from STDIN with iroh blobs add
• Support adding single blobs without a wrapping collection
• Support BlobFormat in tickets
• Preparations to have a seperate iroh provide or iroh send command that would start a temp node (similar to get)

Notes & open questions

Change checklist

• Self-review.
• Documentation updates if relevant.
• Tests if relevant.

[rklaehn]

maybe not for now, but isn't the question whether to include the directory name basically the same thing as wrap_in_collection? E.g. you add a directory , you might want to preserve the file name.

[rklaehn]

This should allow adding bare blobs without a wrapping collection. But how do I actually do it, from the CLI?

I tried adding a single file, and it always produces a wrapping collection. I also don't see a CLI option to disable that.

Tried this:

cargo run blob add ../testdir_large_files/test1

[Frando]

Alright:

• Rebased on main
• Combined the add options into a struct for more code reuse:
• Added a --wrap option and support it throughout the interfaces From the docs:

    /// Wrap the added file or directory in a collection.
    ///
    /// When adding a single file, without `wrap` the file is added as a single blob and no
    /// collection is created. When enabling `wrap` it also creates a collection with a
    /// single entry, where the entry's name is the filename and the entry's content is blob.
    ///
    /// When adding a directory, a collection is always created.
    /// Without `wrap`, the collection directly contains the entries from the added direcory.
    /// With `wrap`, the directory will be nested so that all names in the collection are
    /// prefixed with the directory name, thus preserving the name of the directory.
    ///
    /// When adding content from STDIN and setting `wrap` you also need to set `filename` to name
    /// the entry pointing to the content from STDIN.

From my point this is as intuitive as it gets and ready to merge.

[rklaehn]

~So what does this do if you give the path to a single file when doing iroh start? It seems that it wraps in a collection, which is
inconsistent with the default of add.

Other than that, seems to work just fine.~

Nah, all good. Seems to work.