Direct Message [Action Sheet]: add Action sheet for a DM conversation

Fixes #1272

Author: Abhisheksainii

assets/l10n/app_en.arb

@@ -792,5 +792,9 @@
   "scrollToBottomTooltip": "Scroll to bottom",
   "@scrollToBottomTooltip": {
     "description": "Tooltip for button to scroll to bottom."
+  },
+  "showUsersInDM": "Show users in DM",
+  "@showUsersInDM": {
+    "description": "Label for showing users in DM through DM Action Sheet"
   }
 }

lib/api/model/model.dart

@@ -949,3 +949,8 @@ enum PropagateMode {
 
   String toJson() => _$PropagateModeEnumMap[this]!;
 }
+
+enum DMActionSheetOption{
+  markAsRead,
+  groupDmUsers,
+}

lib/generated/l10n/zulip_localizations.dart

@@ -1166,6 +1166,12 @@ abstract class ZulipLocalizations {
   /// In en, this message translates to:
   /// **'Scroll to bottom'**
   String get scrollToBottomTooltip;
+
+  /// Label for showing users in DM through DM Action Sheet
+  ///
+  /// In en, this message translates to:
+  /// **'Show users in DM'**
+  String get showUsersInDM;
 }
 
 class _ZulipLocalizationsDelegate extends LocalizationsDelegate<ZulipLocalizations> {

lib/generated/l10n/zulip_localizations_ar.dart

@@ -620,4 +620,7 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
 
   @override
   String get scrollToBottomTooltip => 'Scroll to bottom';
+
+  @override
+  String get showUsersInDM => 'Show users in DM';
 }

lib/generated/l10n/zulip_localizations_en.dart

@@ -620,4 +620,7 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
 
   @override
   String get scrollToBottomTooltip => 'Scroll to bottom';
+
+  @override
+  String get showUsersInDM => 'Show users in DM';
 }

lib/generated/l10n/zulip_localizations_ja.dart

@@ -620,4 +620,7 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
 
   @override
   String get scrollToBottomTooltip => 'Scroll to bottom';
+
+  @override
+  String get showUsersInDM => 'Show users in DM';
 }

lib/generated/l10n/zulip_localizations_nb.dart

@@ -620,4 +620,7 @@ class ZulipLocalizationsNb extends ZulipLocalizations {
 
   @override
   String get scrollToBottomTooltip => 'Scroll to bottom';
+
+  @override
+  String get showUsersInDM => 'Show users in DM';
 }

lib/generated/l10n/zulip_localizations_pl.dart

@@ -620,4 +620,7 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
 
   @override
   String get scrollToBottomTooltip => 'Scroll to bottom';
+
+  @override
+  String get showUsersInDM => 'Show users in DM';
 }

lib/generated/l10n/zulip_localizations_ru.dart

@@ -620,4 +620,7 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
 
   @override
   String get scrollToBottomTooltip => 'Scroll to bottom';
+
+  @override
+  String get showUsersInDM => 'Show users in DM';
 }

lib/generated/l10n/zulip_localizations_sk.dart

@@ -620,4 +620,7 @@ class ZulipLocalizationsSk extends ZulipLocalizations {
 
   @override
   String get scrollToBottomTooltip => 'Scroll to bottom';
+
+  @override
+  String get showUsersInDM => 'Show users in DM';
 }