Move Clippy configuration to the workspace level (#8891)

This PR moves the Clippy configuration up to the workspace level.

We're using the [`lints`
table](https://doc.rust-lang.org/cargo/reference/workspaces.html#the-lints-table)
to configure the Clippy ruleset in the workspace's `Cargo.toml`.

Each crate in the workspace now has the following in their own
`Cargo.toml` to inherit the lints from the workspace:

```toml
[lints]
workspace = true
```

This allows for configuring rust-analyzer to show Clippy lints in the
editor by using the following configuration in your Zed `settings.json`:

```json
{
  "lsp": {
    "rust-analyzer": {
      "initialization_options": {
        "check": {
          "command": "clippy"
        }
      }
    }
  }
```

Release Notes:

- N/A

crates/extension_api/Cargo.toml

@@ -4,6 +4,9 @@ version = "0.1.0"
 edition = "2021"
 license = "Apache-2.0"
 
+[lints]
+workspace = true
+
 [lib]
 path = "src/extension_api.rs"