chore: add issues templates (#1786)

.github/workflows/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Template for bug reports
+title: '[Bug]: '
+labels:
+  - bug
+body:
+  - type: input
+    attributes:
+      label: MQTTjs Version
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Broker
+      description: >-
+        The broker you are using (Aedes, Mosca, mosquitto, RabbitMQ, HiveMQ
+        etc...)
+    validations:
+      required: true
+  - type: dropdown
+    attributes:
+      label: Environment
+      options:
+        - NodeJS
+        - Browser
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Description
+      description: A clear and concise description of the problem
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Minimal Reproduction
+      description: provide steps to reproduce the problem
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Debug logs
+      description: Provide logs to help diagnose your issue
+      placeholder: >-
+        On NodeJS simply run your application using `DEBUG=mqttjs*` env var, on
+        browsers you should enable `verbose` level in console or you can set
+        `log` option to `console.log.bind(console)`
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: >-
+        This template was generated with [Issue Forms
+        Creator](https://issue-forms-creator.netlify.app)

.github/workflows/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: ❓ Ask a Question
+    url: https://github.com/mqttjs/MQTT.js/discussions/new
+    about: If you have any other questions, ask them here.

.github/workflows/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.