Update issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Create a report to help us improve
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+      placeholder: Tell us what you see!
+    validations:
+      required: true
+  - type: textarea
+    id: repro-steps
+    attributes:
+      label: To Reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Fetch a '...'
+        2. Update the '....'
+        3. See error
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: code-snippets
+    attributes:
+      label: Code snippets
+      description: If applicable, add code snippets to help explain your problem.
+      render: Java
+    validations:
+      required: false
+  - type: input
+    id: os
+    attributes:
+      label: OS
+      placeholder: macOS
+    validations:
+      required: true
+  - type: input
+    id: language-version
+    attributes:
+      label: Java version
+      placeholder: Java 17
+    validations:
+      required: true
+  - type: input
+    id: lib-version
+    attributes:
+      label: stripe-java version
+      placeholder: v20.114.0
+    validations:
+      required: true
+  - type: input
+    id: api-version
+    attributes:
+      label: API version
+      description: See [Versioning](https://stripe.com/docs/api/versioning) in the API Reference to find which version you're using
+      placeholder: "2020-08-27"
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Stripe support
+    url: https://support.stripe.com/
+    about: |
+      Please only file issues here that you believe represent actual bugs or feature requests for the Stripe Java client library.
+
+      If you're having general trouble with your Stripe integration, please reach out to support.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea for this library
+labels: ["feature-request"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add any other context about the feature request here.