Add templates for PR and issues (#533)

Co-authored-by: Philipp Sauter <46172817+sauterp@users.noreply.github.com>

.github/ISSUE_TEMPLATE/bug-report.yml

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+---
+name: Bug Report
+description: File a bug report
+title: "[Bug]: "
+labels: ["bug", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    attributes:
+      label: Current Behavior
+      description: A concise description of what you're experiencing.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected Behavior
+      description: A concise description of what you expected to happen.
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Steps To Reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. In this environment...
+        1. With this config...
+        1. Run '...'
+        1. See error...
+    validations:
+      required: false
+  - type: input
+    id: cli_version
+    attributes:
+      label: CLI Version
+      description: What version of the CLI are you running?
+    validations:
+      required: true
+  - type: input
+    id: os_platform
+    attributes:
+      label: Os platform
+      description: What version of OS are you using?
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell

.github/ISSUE_TEMPLATE/config.yml

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+---
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+---
+name: Feature Request
+description: File a feature request
+title: "[Feature Request]: "
+labels: ["feature request"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request!
+  - type: textarea
+    id: what-feature
+    attributes:
+      label: What feature would you like to have in the cli?
+      description: Also tell us, what would you expect to happen?
+      placeholder: Tell us what you want!
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/other_request.yml

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+---
+name: Other Request
+description: File a request
+title: "[Request]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this request!
+  - type: textarea
+    id: request
+    attributes:
+      label: Your request
+      description: Describe your request
+    validations:
+      required: true

.github/pull_request_template.md

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+# Description
+<!--
+* Prefix: the title with the component name being changed. Add a short and self describing sentence to ease the review
+* Please add a few lines providing context and describing the change
+* Please self comment changes whenever applicable to help with the review process
+* Please keep the checklist as part of the PR. Tick what applies to this change.
+-->
+
+## Checklist
+(For exoscale contributors)
+
+* [ ] Changelog updated (under *Unreleased* block)
+* [ ] Testing
+
+## Testing
+
+<!--
+Describe the tests you did
+-->