Update issue templates to point to the Discourse forum (google-gemini#148)

Author: ymodak

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,23 @@
+name: Bug report
+description: Use this template to report bugs
+labels: ["type:bug", "component:swift sdk"]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        **Note:** If this is a support question (e.g. _How do I do XYZ?_), please visit the [Discourse forum](https://discuss.ai.google.dev/). This is a great place to interact with developers, and to learn, share, and support each other.
+  - type: textarea
+    id: description
+    attributes:
+      label: >
+        Description of the bug:
+  - type: textarea
+    id: behavior
+    attributes:
+      label: >
+        Actual vs expected behavior:
+  - type: textarea
+    id: info
+    attributes:
+      label: >
+        Any other information you'd like to share?

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,23 @@
+name: Feature request
+description: Use this template to suggest a new feature
+labels: ["type:feature request", "component:swift sdk"]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        **Note:** If this is a support question (e.g. _How do I do XYZ?_), please visit the [Discourse forum](https://discuss.ai.google.dev/). This is a great place to interact with developers, and to learn, share, and support each other.
+  - type: textarea
+    id: description
+    attributes:
+      label: >
+        Description of the feature request:
+  - type: textarea
+    id: behavior
+    attributes:
+      label: >
+        What problem are you trying to solve with this feature?
+  - type: textarea
+    id: info
+    attributes:
+      label: >
+        Any other information you'd like to share?