docs: Change issue templates to issue form

Author: haozhihan

.github/ISSUE_TEMPLATE/bug-report.md

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+name: Bug Report
+description: Create a report for problems with ABACUS
+labels: Bug
+assignees: 
+  - dyzheng
+body: 
+- type: textarea
+  attributes:
+    label: Describe the bug
+    description: >
+      A clear and concise description of what the bug is. 
+      The bug may results in:
+      
+      - abnormal interruption of the program,
+      
+      - systematic or randomized numerical error, or
+      
+      - relatively low efficiency.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Expected behavior
+    description: >
+      A clear and concise description of what you expected to happen.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: To Reproduce
+    description: >
+      Steps to reproduce the behavior:
+      
+      1. [e.g. clone the source code from ...]
+      
+      2. [e.g. configure CMake with options ...]
+      
+      3. [e.g. build ABACUS with ...]
+      
+      4. [e.g. run ABACUS with ...]
+      
+      
+      It is recommended to attach your calculation case here for the developers to reproduce the bug.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Environment
+    description: >
+      - OS: [e.g. Ubuntu 20.04]
+      
+      - Compiler: [e.g. gcc 5.1.0]
+      
+      - Dependencies: [e.g. Intel MKL, OpenBLAS]
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Additional Context
+    description: >
+      Add any other context about the problem here.
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!
+
+

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Feature Request
+description: Suggest something more for ABACUS to do
+labels: Feature
+assignees: 
+  - mohanchen
+
+body:
+- type: textarea
+  attributes:
+    label: Background
+    description: >
+      A clear and concise description of why this new feature is important.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Describe the solution you'd like
+    description: >
+      A clear and concise description of what you want to happen.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Additional Context
+    description: >
+      Add any other context or screenshots about the feature request here.
+
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/feature-request.md

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+name: Functionality Request
+description: Suggest something more for ABACUS to do
+labels: enhancement
+assignees: 
+  - mohanchen
+
+body:
+- type: textarea
+  attributes:
+    label: Background
+    description: >
+      A clear and concise description of why this new feature is important.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Describe the solution you'd like
+    description: >
+      A clear and concise description of what you want to happen.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Additional Context
+    description: >
+      Add any other context or screenshots about the feature request here.
+
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Help Wanted
+description: For general questions or assistance.
+labels: Help wanted
+assignees: 
+  - caic99
+
+body:
+- type: textarea
+  attributes:
+    label: Details
+    description: >
+      Want to use ABACUS for certain system? Facing problems when installing ABACUS? Don't know how to choose a good parameter? Feel free to reach us, and we'll do our best to help!
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/functionality-request.md

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+name: Software Enhancements
+description: Suggest an idea to make ABACUS more robust and organized
+labels: Refactor
+assignees: 
+  - caic99
+
+body:
+- type: textarea
+  attributes:
+    label: Describe Current Status and Possible Solution
+    description: >
+      A clear and concise description of why this enhancement is important. 
+
+      Describing the current situation of ABACUS is preferred.
+      
+      If you have some ideas about how to achieve it, please feel free to comment.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Additional Context
+    description: >
+      Add any other context or screenshots about the enhancement here.
+
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!