Add issue templates

These issue templates are inspired by the ones from godot-vscode-plugin.

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a bug in Godot Git Plugin
+labels:
+  - bug
+body:
+
+- type: markdown
+  attributes:
+    value: |
+      - Write a descriptive issue title above.
+      - Search [open](https://github.com/godotengine/godot-git-plugin/issues) and [closed](https://github.com/godotengine/godot-git-plugin/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported.
+      - Verify that you are using a [supported Godot version](https://docs.godotengine.org/en/stable/about/release_policy.html).
+      - This repository only contains the Git integration. Issues pertaining to the Godot editor itself or the general version control UI should be reported on the [main Godot repository](https://github.com/godotengine/godot/issues).
+
+- type: input
+  attributes:
+    label: Godot version
+    description: >
+      Specify the Git commit hash if using a development or non-official build.
+      If you use a custom build, please test if your issue is reproducible in official builds too.
+    placeholder: 4.4.1.stable, 4.5.dev4 (209a446e3)
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: Godot Git Plugin version
+    description: >
+      Specify the Git commit hash if using a development or non-official build.
+      If you use a custom build, please test if your issue is reproducible in official builds too.
+    placeholder: "3.2.0"
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: System information
+    description: |
+      Specify the OS version, and when relevant hardware information.
+    placeholder: Windows 10
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Issue description
+    description: |
+      Describe your issue briefly. What doesn't work, and how do you expect it to work instead?
+      You can include images or videos with drag and drop, and format code blocks or logs with <code>```</code> tags.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Steps to reproduce
+    description: |
+      List of steps or sample code that reproduces the issue. Having reproducible issues is a prerequisite for contributors to be able to solve them.
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+
+contact_links:
+  - name: Godot community channels
+    url: https://godotengine.org/community
+    about: Please ask for technical support on one of the other community channels, not here.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Request a new feature to be added or improved in Godot Git Plugin
+labels:
+  - enhancement
+body:
+
+- type: markdown
+  attributes:
+    value: |
+      - Write a descriptive issue title above.
+      - Search [open](https://github.com/godotengine/godot-git-plugin/issues) and [closed](https://github.com/godotengine/godot-git-plugin/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported.
+      - Verify that you are using a [supported Godot version](https://docs.godotengine.org/en/stable/about/release_policy.html).
+      - This repository only contains the Git integration. Issues pertaining to the Godot editor itself or the general version control UI should be reported on the [main Godot repository](https://github.com/godotengine/godot/issues).
+
+- type: input
+  attributes:
+    label: Godot version
+    description: >
+      Specify the Git commit hash if using a development or non-official build.
+      If you use a custom build, please test if your issue is reproducible in official builds too.
+    placeholder: 4.4.1.stable, 4.5.dev4 (209a446e3)
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: Godot Git Plugin version
+    description: >
+      Specify the Git commit hash if using a development or non-official build.
+      If you use a custom build, please test if your issue is reproducible in official builds too.
+    placeholder: "3.2.0"
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: System information
+    description: |
+      Specify the OS version, and when relevant hardware information.
+    placeholder: Windows 10
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Problem statement
+    description: |
+      Describe the problem or limitation you're currently facing with the Godot Git Plugin.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Proposed solution
+    description: |
+      Describe your proposed solution and how it resolves the problem or limitation mentioned above.
+      You can include images or videos with drag and drop, and format code blocks or logs with <code>```</code> tags.
+  validations:
+    required: true