feat: add minimum supported axoupdater check (library)

[mistydemeo]

This adds a check when building Rust software which uses axoupdater as a library. If the user is using a version older than what this version of cargo-dist was for, it emits a warning at buildtime. I tested it on cargo-dist itself by bumping the const to something that doesn't exist, and confirmed it works:

 WARN Your project uses axoupdater as a library. We've detected that you're using 0.7.2, but this version of cargo-dist expects a version of at least 0.10.0 (or greater). Please consider updating to ensure your users don't experience inconsistent update behaviour.

To support this, I added support in axoproject for detecting if axoupdater is present and, if it is, its version is recorded. I briefly considered tracking the full dep tree in the axoproject info but that seemed like overkill.

Fixes #1392.

[Gankra]

Approved but some changes to make

[mistydemeo]

Pushed up a version with some changes.

I realized that since we were already iterating over direct packages in the workspace and not transitive dependencies (and since Gankra's suggestion was to ignore unexpected packages), we could do this a little easier by putting that dependency info on each package rather than on the workspace. Makes it easier to decide if we need to care about that axoupdater version per-package. We don't - currently - know of any projects that actually transitively depend on axoupdater, I suppose.

[ashleygwilliams]

some comments, mostly focused on: if we error on a transitive dep, we need to give the user more info. also makes a suggestion that we link to a docs page on this with the error.

[mistydemeo]

Fixed a bug that caused us to report the wrong transitive dep version. Works fine for both direct and transitive deps now.

Direct:

  × Your project (cargo-dist) uses axoupdater as a library, but the version specified (0.7.2) is older than the
  │ minimum supported version (0.10.0). (The dependency comes via cargo-dist in the dependency tree.)
  help: https://opensource.axo.dev/cargo-dist/book/installers/updater.html#minimum-supported-updater-version-
        checking

Transitive:

  × Your project (deptest) uses axoupdater as a library, but the version specified (0.7.2) is older than the minimum
  │ supported version (0.10.0). (The dependency comes via cargo-dist in the dependency tree.)
  help: https://opensource.axo.dev/cargo-dist/book/installers/updater.html#minimum-supported-updater-version-
        checking