[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/sysfs/datasync_tinygo.go

@@ -0,0 +1,13 @@
+//go:build tinygo
+
+package sysfs
+
+import (
+	"os"
+
+	"github.com/tetratelabs/wazero/experimental/sys"
+)
+
+func datasync(f *os.File) sys.Errno {
+	return sys.ENOSYS
+}