Related to #1547: use dioxus-cli within a workspace (wildcard-members, real package names) (#1642)

* Related to #1547: use `dioxus-cli` within a workspace

Although the `dx` CLI allows to specify a package name to chose from workspace members,
it does not support workspace members specified as glob-wildcards.
Neither it respects the effective package name, specified in the crate's `Cargo.toml`.

This PR addresses that issue:
- upon `dx build ...`, if the `--bin` CLI-argument is provided, treat the current dir as a workspace;
- search through the workspace's `members`: resolve each of them with `glob`;
- assume that any workspace member has a `Cargo.toml` in it (cargo does it, so it's okay);
- read said manifest, and check the package name in it;
- if found — there we have our sought package.

* Use cargo-metadata to find out the workspace structure

* glob is unused

packages/cli/src/error.rs

@@ -29,6 +29,9 @@ pub enum Error {
     #[error("Cargo Error: {0}")]
     CargoError(String),
 
+    #[error("Couldn't retrieve cargo metadata")]
+    CargoMetadata(#[source] cargo_metadata::Error),
+
     #[error("{0}")]
     CustomError(String),