[experiment] add alternative wasm sqlite3 implementation available via build-tag (#2863)

This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).

vendor/github.com/ncruces/go-sqlite3/embed/init.go

@@ -0,0 +1,20 @@
+// Package embed embeds SQLite into your application.
+//
+// Importing package embed initializes the [sqlite3.Binary] variable
+// with an appropriate build of SQLite:
+//
+//	import _ "github.com/ncruces/go-sqlite3/embed"
+package embed
+
+import (
+	_ "embed"
+
+	"github.com/ncruces/go-sqlite3"
+)
+
+//go:embed sqlite3.wasm
+var binary []byte
+
+func init() {
+	sqlite3.Binary = binary
+}