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/members/chat_member.go

@@ -0,0 +1,77 @@
+package members
+
+import (
+	"context"
+	"time"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/peers"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// ChatMember is chat Member.
+type ChatMember struct {
+	parent      *ChatMembers
+	creatorDate time.Time
+	user        peers.User
+	inviter     peers.User
+	raw         tg.ChatParticipantClass
+}
+
+// Raw returns raw member object.
+func (c ChatMember) Raw() tg.ChatParticipantClass {
+	return c.raw
+}
+
+// Status returns member Status.
+func (c ChatMember) Status() Status {
+	switch c.raw.(type) {
+	case *tg.ChatParticipant:
+		return Plain
+	case *tg.ChatParticipantCreator:
+		return Creator
+	case *tg.ChatParticipantAdmin:
+		return Admin
+	default:
+		return -1
+	}
+}
+
+// JoinDate returns member join date, if it is available.
+func (c ChatMember) JoinDate() (time.Time, bool) {
+	switch p := c.raw.(type) {
+	case *tg.ChatParticipant:
+		return time.Unix(int64(p.Date), 0), true
+	case *tg.ChatParticipantCreator:
+		return c.creatorDate, true
+	case *tg.ChatParticipantAdmin:
+		return time.Unix(int64(p.Date), 0), true
+	default:
+		return time.Time{}, false
+	}
+}
+
+// InvitedBy returns user that invited this member.
+func (c ChatMember) InvitedBy() (peers.User, bool) {
+	switch c.raw.(type) {
+	case *tg.ChatParticipant:
+		return c.inviter, true
+	case *tg.ChatParticipantCreator:
+		return peers.User{}, false
+	case *tg.ChatParticipantAdmin:
+		return c.inviter, true
+	default:
+		return peers.User{}, false
+	}
+}
+
+// User returns member User object.
+func (c ChatMember) User() peers.User {
+	return c.user
+}
+
+// Kick kicks this member.
+//
+// If revokeHistory is set, will delete all messages from this member.
+func (c ChatMember) Kick(ctx context.Context, revokeHistory bool) error {
+	return c.parent.Kick(ctx, c.user.InputUser(), revokeHistory)
+}