chore: add GitHub Issue templates for bug reports and feature requests

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report to help us improve the SDK
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: dropdown
+    id: sdk_version
+    attributes:
+      label: SDK Version
+      description: What version of the pg-sdk-java are you using?
+      options:
+        - 2.2.3
+        - 2.2.2
+        - 2.2.1
+        - Other (specify in description)
+    validations:
+      required: true
+  - type: input
+    id: java_version
+    attributes:
+      label: Java Version
+      description: What version of JDK are you using? (e.g., 17, 21)
+    validations:
+      required: true
+  - type: dropdown
+    id: environment
+    attributes:
+      label: Environment
+      description: Which PhonePe environment does this bug occur in?
+      options:
+        - SANDBOX
+        - PRODUCTION
+    validations:
+      required: true
+  - type: dropdown
+    id: client_type
+    attributes:
+      label: Client Type
+      description: Which SDK client are you using?
+      options:
+        - StandardCheckoutClient
+        - CustomCheckoutClient
+        - SubscriptionClient
+        - BaseClient / Infrastructure
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction_steps
+    attributes:
+      label: Steps to Reproduce
+      description: How can we reproduce this bug?
+      placeholder: |
+        1. Initialize client with...
+        2. Create request...
+        3. Call pay()...
+    validations:
+      required: true
+  - type: textarea
+    id: expected_behavior
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: actual_behavior
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+    validations:
+      required: true
+  - type: textarea
+    id: error_logs
+    attributes:
+      label: Error Logs or Stack Traces
+      description: Paste any relevant error messages or stack traces here.
+      render: java
+    validations:
+      required: false
+  - type: textarea
+    id: additional_context
+    attributes:
+      label: Additional Context
+      description: Add any other context about the problem here (screenshots, related issues, etc).
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: PhonePe Developer Documentation
+    url: https://developer.phonepe.com/
+    about: Check the official documentation before opening an issue
+  - name: PhonePe Developer Portal
+    url: https://developer.phonepe.com/v1/reference/java-sdk-standard-checkout
+    about: SDK-specific API reference and integration guide

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for this SDK
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to suggest a new feature!
+  - type: input
+    id: summary
+    attributes:
+      label: Feature Summary
+      description: A clear and concise one-line summary of the feature.
+    validations:
+      required: true
+  - type: textarea
+    id: use_case
+    attributes:
+      label: Use Case
+      description: Why is this feature needed? What problem does it solve?
+    validations:
+      required: true
+  - type: textarea
+    id: proposed_solution
+    attributes:
+      label: Proposed Solution
+      description: Describe how you think this feature should work.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Describe any alternative solutions or features you've considered.
+    validations:
+      required: false
+  - type: checkboxes
+    id: affected_client
+    attributes:
+      label: Affected Client
+      description: Which parts of the SDK would this feature affect?
+      options:
+        - label: StandardCheckout
+        - label: CustomCheckout
+        - label: Subscription
+        - label: Common / Infrastructure
+  - type: textarea
+    id: additional_context
+    attributes:
+      label: Additional Context
+      description: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false