[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/ncruces/go-sqlite3/internal/util/module.go

@@ -0,0 +1,21 @@
+package util
+
+import (
+	"context"
+
+	"github.com/tetratelabs/wazero/experimental"
+)
+
+type moduleKey struct{}
+type moduleState struct {
+	mmapState
+	handleState
+}
+
+func NewContext(ctx context.Context) context.Context {
+	state := new(moduleState)
+	ctx = withAllocator(ctx)
+	ctx = experimental.WithCloseNotifier(ctx, state)
+	ctx = context.WithValue(ctx, moduleKey{}, state)
+	return ctx
+}