Better error if component from registry has regrettable version

[itowlson]

If you have a component sourced from a registry, the version has to be semver. The previous error message was bad.

Before:

ivan@hestia:~/testing/wkgtest$ spin up
Error: TOML parse error at line 15, column 10
   |
15 | source = { registry = "registrytest-vfztdiyy.fermyon.app", package = "component:ccspintest", version = "canary" }
   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
data did not match any variant of untagged enum ComponentSource

After:

ivan@hestia:~/testing/wkgtest$ spin up
Error: Failed to load manifest from "spin.toml"

Caused by:
   0: Failed to load Spin app from "spin.toml"
   1: Failed to load component `wkgtest`
   2: Failed to load Wasm source "component:ccspintest@canary" from registry Registry(registrytest-vfztdiyy.fermyon.app)
   3: Component wkgtest specifies an invalid semantic version ("canary") for its package version
   4: unexpected character 'c' while parsing major version number

[lann]

Another option here would be a custom deserialize_with; the thing I appreciate about using Version here is that you get nice location information in errors.

NEVER MIND I GET IT NOW