Extract ExtensionIndexedDocsProvider to indexed_docs crate (#20607)

This PR extracts the `ExtensionIndexedDocsProvider` implementation to
the `indexed_docs` crate.

To achieve this, we introduce a new `Extension` trait that provides an
abstracted interface for calling an extension. This trait resides in the
`extension` crate, which has minimal dependencies and can be depended on
by other crates, like `indexed_docs`.

We're then able to implement the `ExtensionIndexedDocsProvider` without
having any knowledge of the Wasm-specific internals of the extension
system.

Release Notes:

- N/A

crates/indexed_docs/Cargo.toml

@@ -17,6 +17,7 @@ async-trait.workspace = true
 cargo_metadata.workspace = true
 collections.workspace = true
 derive_more.workspace = true
+extension.workspace = true
 fs.workspace = true
 futures.workspace = true
 fuzzy.workspace = true
@@ -30,7 +31,6 @@ paths.workspace = true
 serde.workspace = true
 strum.workspace = true
 util.workspace = true
-extension_host.workspace = true
 
 [dev-dependencies]
 indoc.workspace = true