[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/fsapi/unimplemented.go

@@ -0,0 +1,27 @@
+package fsapi
+
+import experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
+
+func Adapt(f experimentalsys.File) File {
+	if f, ok := f.(File); ok {
+		return f
+	}
+	return unimplementedFile{f}
+}
+
+type unimplementedFile struct{ experimentalsys.File }
+
+// IsNonblock implements File.IsNonblock
+func (unimplementedFile) IsNonblock() bool {
+	return false
+}
+
+// SetNonblock implements File.SetNonblock
+func (unimplementedFile) SetNonblock(bool) experimentalsys.Errno {
+	return experimentalsys.ENOSYS
+}
+
+// Poll implements File.Poll
+func (unimplementedFile) Poll(Pflag, int32) (ready bool, errno experimentalsys.Errno) {
+	return false, experimentalsys.ENOSYS
+}