Add templates and workflows for GitHub issues

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Create a bug report
+labels: ["bug", "Status: Needs Triage"]
+body:
+  - type: textarea
+    attributes:
+      label: Description
+      description: "Please provide a minimal way to reproduce the problem and describe what the expected vs actual behavior is. Provide a [3v4l.org](https://3v4l.org/) link if possible."
+      value: |
+        The following code:
+
+        ```php
+        <?php
+        ``` 
+
+        Resulted in this output:
+        ```
+        ``` 
+
+        But I expected this output instead:
+        ```
+        ```
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: PHP Version
+      description: "The used PHP version. Make sure it is [supported](https://www.php.net/supported-versions.php)."
+      placeholder: "PHP 8.0.12"
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Operating System
+      description: "The used operating system, if relevant."
+      placeholder: "Ubuntu 20.04"

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Report a security issue
+    url: https://bugs.php.net/report.php?bug_type=Security
+    about: Please report security issues in this private bug tracker.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Create a feature request
+labels: ["feature", "Status: Needs Triage"]
+body:
+  - type: textarea
+    attributes:
+      label: Description
+      description: "Please describe the requested feature and why it should be included in PHP."
+    validations:
+      required: true

.github/workflows/close-needs-feedback.yml

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+name: Close old issues that need feedback
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Close old issues that need feedback
+        uses: dwieeb/needs-reply@v2
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-label: "Status: Needs Feedback"
+          days-before-close: 14
+          close-message: "No feedback was provided. The issue is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so. Thank you."

.github/workflows/remove-needs-feedback.yml

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+name: Remove needs feedback label
+
+on:
+  issue_comment:
+    types:
+      - created
+
+jobs:
+  build:
+    if: "contains(github.event.issue.labels.*.name, 'Status: Needs Feedback') && github.event.issue.user.login == github.event.sender.login"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          labels: "Status: Needs Feedback"