(new): support Bot API 10.3

(fix): finalize v2 contracts
(tests): cover v2 migration
(doc): prepare release guidance

tgapi/migration_v2_test.go

@@ -0,0 +1,32 @@
+package tgapi
+
+import (
+	"context"
+	"testing"
+)
+
+func TestV2MigrationSurfaceCompiles(t *testing.T) {
+	answer := PollAnswer{User: &User{ID: 1}}
+	if answer.User == nil {
+		t.Fatal("poll voter is missing")
+	}
+
+	_ = ChatFullInfo{AvailableReactions: []ReactionType{}}
+	_ = ReplyParameters{QuoteParseMode: string(ParseHTML)}
+	_ = InputChecklist{OthersCanAddTasks: true, OthersCanMarkTasksAsDone: true}
+	_ = SendMessage{EphemeralMessageParameters: &EphemeralMessageParameters{ReceiverUserID: 1}}
+
+	request := NewRequest[bool]("customMethod", NoParams)
+	upload := NewUploaderRequest[bool]("customUpload", NoParams)
+	var api *API
+	var uploader *Uploader
+	if false {
+		_, _ = api.Do(request)
+		_, _ = api.DoWithContext(context.Background(), request)
+		_, _ = uploader.Do(upload)
+		_, _ = uploader.DoWithContext(context.Background(), upload)
+		_, _ = api.DeleteAllMessageReactions(DeleteAllMessageReactions{})
+		_, _ = api.GetFileByLinkLimit("file/path", 1<<20)
+		_, _ = api.OpenFileByLinkWithContext(context.Background(), "file/path")
+	}
+}