This is a fairly large PR because this dependency is used everywhere.
cargo component now uses the new wasm-pkg-tools toolchain to load deps,
which means that both OCI and Warg are supported. This tries to stay as
close to the original code style as possible, but I did have to make
large changes to how dependencies were being resolved to account for the
new library. There are a couple major breaking changes to be aware of and
one question to answer. This PR is already quite large, so I figured it
would be better to probably merge this and then deal with follow ups to
any of the outstanding questions below:

- Bindings are now generated every time. Where the actual dependency is
  being loaded from is now abstracted away by the client, so we can't
  check if those files have changed on disk. I personally don't think this
  is the worst thing, but if people really want that functionality, we
  can add support for that into the package tools.
- Offline deps currently does not work, but that is something that will
  be added into wasm-pkg-client instead of doing checks within cargo
  component itself.
- Currently the registries specified within Cargo.toml are not used in
  favor of using the config file for wasm-pkg-tools. I am not sure if we
  wanted to use that to override the wasm-pkg-tools config or just drop
  it entirely. I would like to address this one before merge.
- Until wasm-pkg-client has support for publishing, I have left support
  in to use warg directly. Once we have that added to wasm-pkg-tools, we
  can change the behavior here

Signed-off-by: Taylor Thomas <[email protected]>