feat: add issue templates (#282)

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug Report
+description: Create a bug report
+labels: ["C-bug", "S-needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report! Please provide as much detail as possible.
+        
+        If you believe you have found a vulnerability, please provide details [here](mailto:georgios@paradigm.xyz) instead.
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: Describe the bug
+      description: |
+        A clear and concise description of what the bug is.
+        
+        If the bug is in a crate you are using (i.e. you are not running the standard `reth` binary) please mention that as well.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction-steps
+    attributes:
+      label: Steps to reproduce
+      description: Please provide any steps you think might be relevant to reproduce the bug.
+      placeholder: |
+        Steps to reproduce:
+        
+        1. Start '...'
+        2. Then '...'
+        3. Check '...'
+        4. See error
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Node logs
+      description: If applicable, please provide the node logs leading up to the bug.
+      render: text
+    validations:
+      required: false
+  - type: checkboxes
+    id: platform
+    attributes:
+      label: Platform(s)
+      description: What platform(s) did this occur on?
+      options:
+        - Linux (x86)
+        - Linux (ARM)
+        - Mac (Intel)
+        - Mac (Apple Silicon)
+        - Windows (x86)
+        - Windows (ARM)
+    validations:
+      required: false
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/foundry-rs/reth/blob/main/CODE_OF_CONDUCT.md)
+      options:
+        - label: I agree to follow the Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: GitHub Discussions
+    url: https://github.com/foundry-rs/reth/discussions
+    about: Please ask and answer questions here to keep the issue tracker clean.
+  - name: Security
+    url: mailto:georgios@paradigm.xyz
+    about: Please report security vulnerabilities here.

.github/ISSUE_TEMPLATE/docs.yml

@@ -0,0 +1,19 @@
+name: Documentation
+description: Suggest a change to our documentation
+labels: ["C-docs", "S-needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        If you are unsure if the docs are relevant or needed, please open up a discussion first.
+  - type: textarea
+    attributes:
+      label: Describe the change
+      description: |
+        Please describe the documentation you want to change or add, and if it is for end-users or contributors.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context to the feature (like screenshots, resources)

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature request
+description: Suggest a feature
+labels: ["C-enhancement", "S-needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please ensure that the feature has not already been requested in the issue tracker.
+  - type: textarea
+    attributes:
+      label: Describe the feature
+      description: |
+        Please describe the feature and what it is aiming to solve, if relevant.
+        
+        If the feature is for a crate, please include a proposed API surface.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context to the feature (like screenshots, resources)