[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/stat.go

@@ -0,0 +1,16 @@
+package sysfs
+
+import (
+	"io/fs"
+
+	experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
+	"github.com/tetratelabs/wazero/sys"
+)
+
+func defaultStatFile(f fs.File) (sys.Stat_t, experimentalsys.Errno) {
+	if info, err := f.Stat(); err != nil {
+		return sys.Stat_t{}, experimentalsys.UnwrapOSError(err)
+	} else {
+		return sys.NewStat_t(info), 0
+	}
+}