[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/tetratelabs/wazero/internal/u32/u32.go

@@ -0,0 +1,11 @@
+package u32
+
+// LeBytes returns a byte slice corresponding to the 4 bytes in the uint32 in little-endian byte order.
+func LeBytes(v uint32) []byte {
+	return []byte{
+		byte(v),
+		byte(v >> 8),
+		byte(v >> 16),
+		byte(v >> 24),
+	}
+}