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/query/internal/cachedgen/method.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"go/types"
+	"sort"
+	"strings"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/query/internal/genutil"
+)
+
+// Param represents request parameter.
+type Param struct {
+	// Name to use in function declaration.
+	Name string
+	// OriginalName in struct definition.
+	OriginalName string
+	// Go type.
+	Type string
+}
+
+func varToParam(field *types.Var) Param {
+	fieldName := field.Name()
+	fieldName = strings.ToLower(fieldName[:1]) + fieldName[1:]
+	return Param{
+		Name:         fieldName,
+		OriginalName: field.Name(),
+		Type:         genutil.PrintType(field.Type()),
+	}
+}
+
+func sortParams(p []Param) []Param {
+	sort.SliceStable(p, func(i, j int) bool {
+		return p[i].Name < p[j].Name
+	})
+
+	return p
+}
+
+// CachedQuery is a RPC cacheable query helper.
+type CachedQuery struct {
+	// Name of struct to generate.
+	Name string
+	// MethodName is name of method of tg.Client.
+	MethodName string
+	// RequestName is name of request struct.
+	RequestName string
+	// ManualHash determines whether hash must be computed using
+	// hand-written function computeHash or not.
+	// Need to resolve case when Telegram does not return hash with result.
+	ManualHash bool
+	// RequestParams contains additional params to send.
+	RequestParams []Param
+	// ResultName is name of result type.
+	ResultName string
+	// NotModifiedName is name of NotModified result type.
+	NotModifiedName string
+}
+
+// Config is codegeneration config to use.
+type Config struct {
+	// Query helpers to generate.
+	Queries []CachedQuery
+	// ResultName package name
+	Package string
+}