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/tgtest/services/file/config.go

@@ -0,0 +1,24 @@
+package file
+
+type Config struct {
+	// Storage to store files.
+	// InMemory will be used.
+	Storage Storage
+	// HashPartSize is a size of part to use in tg.FileHash.
+	HashPartSize int
+	// HashRangeSize is size of range to return in upload.getFileHashes.
+	HashRangeSize int
+}
+
+func (c *Config) setDefaults() {
+	if c.Storage == nil {
+		c.Storage = NewInMemory()
+	}
+	// Telegram usually uses this values.
+	if c.HashPartSize == 0 {
+		c.HashPartSize = 131072
+	}
+	if c.HashRangeSize == 0 {
+		c.HashRangeSize = 10
+	}
+}