update various repo metadata (#406)

.github/ISSUE_TEMPLATE/async.md

@@ -0,0 +1,5 @@
+---
+name: "package:async"
+about: "Create a bug or file a feature request against package:async."
+labels: "package:async"
+---

.github/ISSUE_TEMPLATE/characters.md

@@ -0,0 +1,5 @@
+---
+name: "package:characters"
+about: "Create a bug or file a feature request against package:characters."
+labels: "package:characters"
+---

.github/ISSUE_TEMPLATE/convert.md

@@ -0,0 +1,5 @@
+---
+name: "package:convert"
+about: "Create a bug or file a feature request against package:convert."
+labels: "package:convert"
+---

.github/ISSUE_TEMPLATE/crypto.md

@@ -0,0 +1,5 @@
+---
+name: "package:crypto"
+about: "Create a bug or file a feature request against package:crypto."
+labels: "package:crypto"
+---

.github/ISSUE_TEMPLATE/fixnum.md

@@ -0,0 +1,5 @@
+---
+name: "package:fixnum"
+about: "Create a bug or file a feature request against package:fixnum."
+labels: "package:fixnum"
+---

.github/workflows/args.yaml

@@ -1,4 +1,4 @@
-name: Dart CI
+name: package:args
 
 on:
   # Run CI on pushes to the main branch, and on PRs against main.

pkgs/characters/pubspec.yaml

@@ -3,6 +3,7 @@ version: 1.3.1
 description: >-
   String replacement with operations that are Unicode/grapheme cluster aware.
 repository: https://github.com/dart-lang/core/tree/main/pkgs/characters
+
 topics:
   - strings
   - unicode