[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/platform/path.go

@@ -0,0 +1,6 @@
+//go:build !windows
+
+package platform
+
+// ToPosixPath returns the input, as only windows might return backslashes.
+func ToPosixPath(in string) string { return in }