Extension refactor (#20305)

This contains the main changes to the extensions crate from #20049. The
primary goal here is removing dependencies that we can't include on the
remote.


Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Marshall <marshall@zed.dev>

crates/extension_host/src/wasm_host/wit.rs

@@ -3,10 +3,12 @@ mod since_v0_0_4;
 mod since_v0_0_6;
 mod since_v0_1_0;
 mod since_v0_2_0;
-use indexed_docs::IndexedDocsDatabase;
+// use indexed_docs::IndexedDocsDatabase;
 use release_channel::ReleaseChannel;
 use since_v0_2_0 as latest;
 
+use crate::DocsDatabase;
+
 use super::{wasm_engine, WasmState};
 use anyhow::{anyhow, Context, Result};
 use language::{LanguageServerName, LspAdapterDelegate};
@@ -394,7 +396,7 @@ impl Extension {
         store: &mut Store<WasmState>,
         provider: &str,
         package_name: &str,
-        database: Resource<Arc<IndexedDocsDatabase>>,
+        database: Resource<Arc<dyn DocsDatabase>>,
     ) -> Result<Result<(), String>> {
         match self {
             Extension::V020(ext) => {