chore: add issue forms (#4617)

.github/ISSUE_TEMPLATE/bug.yml

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+name: 🐞 Bug Report
+description: Tell us about something that's not working the way we (probably) intend.
+labels: 'Type: Bug'
+body:
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+        - label: I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
+          required: true
+        - label: I have reviewed the documentation https://docs.sentry.io/
+          required: true
+        - label: I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases
+          required: true
+  - type: dropdown
+    id: type
+    attributes:
+      label: How do you use Sentry?
+      options:
+        - Sentry Saas (sentry.io)
+        - Self-hosted/on-premise
+    validations:
+      required: true
+  - type: dropdown
+    id: package
+    attributes:
+      label: Which package are you using?
+      options:
+        - @sentry/angular
+        - @sentry/browser
+        - @sentry/ember
+        - @sentry/gatsby
+        - @sentry/nextjs
+        - @sentry/node
+        - @sentry/react
+        - @sentry/serverless
+        - @sentry/vue
+        - @sentry/wasm
+    validations:
+      required: true
+  - type: input
+    id: sdk-version
+    attributes:
+      label: SDK Version
+      description: What version of the SDK are you using?
+      placeholder: ex. 1.5.2
+    validations:
+      required: true
+  - type: input
+    id: framework-version
+    attributes:
+      label: Framework Version
+      description: If you're using one of our framework-specific SDKs (`@sentry/react`, for example), what version of the framework are you using?
+      placeholder: ex. 1.5.2
+  - type: input
+    id: link-to-sentry
+    attributes:
+      label: Link to Sentry event
+      description: If applicable, provide a link to the affected event from your Sentry account. The event will only be viewable by Sentry staff. **Note**: This should be an _event_ link, not an issue link, and should match the form shown below. It can be found by clicking on the event ID on the issue details page.
+      placeholder: https://sentry.io/organizations/<org-slug>/issues/<issue-id>/events/<event-id>/?project=<project-id>
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to Reproduce
+      description: How can we see what you're seeing? Specific is terrific.
+      placeholder: |-
+        1. What
+        2. you
+        3. did.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Result
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Result
+      description: Logs? Screenshots? Yes, please.
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |-
+        ## Thanks 🙏
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question
+    url: https://github.com/getsentry/sentry-javascript/issues
+    about: Ask questions and discuss with other community members

.github/ISSUE_TEMPLATE/feature.yml

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+name: 💡 Feature Request
+description: Create a feature request for a sentry-javascript SDK.
+labels: 'Type: Improvement'
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for taking the time to file a feature request! Please fill out this form as completely as possible.
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: A clear and concise description of what you want and what your use case is.
+      placeholder: |-
+        I want to make whirled peas, but Sentry doesn't blend.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Solution Brainstorm
+      description: We know you have bright ideas to share ... share away, friend.
+      placeholder: |-
+        Add a blender to Sentry.
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |-
+        ## Thanks 🙏
+        Check our [triage docs](https://open.sentry.io/triage/) for what to expect next.