move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/peers/search.go

@@ -0,0 +1,55 @@
+package peers
+
+import (
+	"context"
+
+	"github.com/go-faster/errors"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// SearchResult is Search query result.
+type SearchResult struct {
+	MyResults []Peer
+	Results   []Peer
+}
+
+// Search searches peers by given query.
+func (m *Manager) Search(ctx context.Context, q string) (SearchResult, error) {
+	convert := func(input []tg.PeerClass) ([]Peer, error) {
+		resolved := make([]Peer, len(input))
+		for i, p := range input {
+			r, err := m.ResolvePeer(ctx, p)
+			if err != nil {
+				return nil, errors.Wrapf(err, "resolve %d (%+v)", i, p)
+			}
+			resolved[i] = r
+		}
+		return resolved, nil
+	}
+
+	found, err := m.api.ContactsSearch(ctx, &tg.ContactsSearchRequest{
+		Q:     q,
+		Limit: 10,
+	})
+	if err != nil {
+		return SearchResult{}, errors.Wrap(err, "search")
+	}
+
+	if err := m.applyEntities(ctx, found.Users, found.Chats); err != nil {
+		return SearchResult{}, err
+	}
+
+	var r SearchResult
+
+	r.MyResults, err = convert(found.MyResults)
+	if err != nil {
+		return SearchResult{}, errors.Wrap(err, "my results")
+	}
+	r.Results, err = convert(found.Results)
+	if err != nil {
+		return SearchResult{}, errors.Wrap(err, "results")
+	}
+
+	return r, nil
+}