Add Ask Mode Change Template

.github/ISSUE_TEMPLATE/breaking_change.yml

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+# This issue template is for use in opening issues that document breaking changes. This template should be used to create an issue by Microsoft product team members who are documenting a breaking change.
+# 
+# Bracketed text is a placeholder; replace the text with the requested information and remove the brackets before submitting the issue. Also, remove this comment before submitting the issue.
+
+name: "Identity Model breaking change"
+description: Report a change in Identity Model that breaks something that worked in a previous version. This form is intended to be used by the product team.
+title: "[Breaking change]: "
+labels: "Breaking change"
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Brief description of the breaking change.
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: What version of Identity Model introduced the breaking change?
+    validations:
+      required: true
+  - type: textarea
+    id: old-behavior
+    attributes:
+      label: Previous behavior
+      description: Describe the previous behavior. Include code snippets if applicable.
+    validations:
+      required: true
+  - type: textarea
+    id: new-behavior
+    attributes:
+      label: New behavior
+      description: Describe the new behavior. Include code snippets if applicable.
+    validations:
+      required: true
+  - type: checkboxes
+    id: change-type
+    attributes:
+      label: Type of breaking change
+      description: This information will be used to label the issue appropriately. [(How do I decide?)](https://learn.microsoft.com/dotnet/core/compatibility/categories)
+      options:
+        - label: "**Binary incompatible**: Existing binaries may encounter a breaking change in behavior, such as failure to load or execute, and if so, require recompilation."
+        - label:  "**Source incompatible**: When recompiled using the new SDK or component or to target the new runtime, existing source code may require source changes to compile successfully."
+        - label:  "**Behavioral change**: Existing binaries may behave differently at run time."
+    validations:
+      required: true
+  - type: textarea
+    id: reason
+    attributes:
+      label: Reason for change
+      description: Describe why the breaking change was introduced.
+    validations:
+      required: true
+  - type: textarea
+    id: recommended-action
+    attributes:
+      label: Recommended action
+      description: Describe the recommended action an affected user should take, such as workarounds or examples of code changes.
+    validations:
+      required: true
+  - type: textarea
+    id: affected-apis
+    attributes:
+      label: Affected APIs
+      description: List all the APIs affected by this change. For methods, clarify if it's all overloads or specific overloads.
+      placeholder: None.
+    validations:
+      required: true