New issue templates (#399)

.github/ISSUE_TEMPLATE/bug_report.yaml

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+name: Bug Report
+description: File a bug report
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting an issue, please review the task list below before submitting the issue. Your issue report will be closed if the issue is incomplete and the below tasks not completed.
+
+        NOTE: If you are unsure about something and the issue is more of a question a better place to ask questions is on Github Discussions :arrow_up:, [Stack Overflow](https://stackoverflow.com/tags/micronaut) or [Gitter](https://gitter.im/micronautfw/).
+  - type: textarea
+    attributes:
+      label: Expected Behavior
+      description: A concise description of what you expected to happen.
+      placeholder: Tell us what should happen
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Actual Behaviour
+      description: A concise description of what you're experiencing.
+      placeholder: Tell us what happens instead
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Steps To Reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. In this environment...
+        2. With this config...
+        3. Run '...'
+        4. See error...
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Environment Information
+      description: Environment information where the problem occurs.
+      placeholder: |
+        - Operating System:
+        - JDK Version:
+    validations:
+      required: false
+  - type: input
+    id: example
+    attributes:
+      label: Example Application
+      description: Example application link.
+      placeholder: |
+        Link to GitHub repository with an example that reproduces the issue
+    validations:
+      required: false
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: Micronaut version
+    validations:
+      required: true
+

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Micronaut Core Discussions
+    url: https://github.com/micronaut-projects/micronaut-core/discussions
+    about: Ask questions about Micronaut on Github
+  - name: Micronaut Data Discussions
+    url: https://github.com/micronaut-projects/micronaut-data/discussions
+    about: Ask Micronaut Data related questions on Github
+  - name: Stack Overflow
+    url: https://stackoverflow.com/tags/micronaut
+    about: Ask questions on Stack Overflow
+  - name: Chat
+    url: https://gitter.im/micronautfw/
+    about: Chat with us on Gitter.

.github/ISSUE_TEMPLATE/new_feature.yaml

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+name: Feature request
+description: Create a new feature request
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please describe the feature you want for Micronaut to implement, before that check if there is already an existing issue to add it.
+  - type: textarea
+    attributes:
+      label: Feature description
+      placeholder: Tell us what feature you would like for Micronaut to have and what problem is it going to solve
+    validations:
+      required: true
+

.github/ISSUE_TEMPLATE/other.yaml

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+name: Other
+description: Something different
+body:
+  - type: textarea
+    attributes:
+      label: Issue description
+    validations:
+      required: true
+