chore(ci): define Github labels as code with a workflow (#93)

.github/labels.yml

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+# libevm specific labels
+- name: "Status: 🔴 Blocked by Geth sync"
+  color: "959a9c"
+  description: "This needs to wait for the next fork sync with the geth repository 🍴"
+- name: "Status: 🔴 DO NOT MERGE"
+  color: "959a9c"
+  from_name: "DO NOT MERGE"
+
+# General categories
+- name: "Category: New feature 🆕"
+  color: "ffc7ea"
+- name: "Category: Documentation ✒️"
+  description: "A problem with the readme or a code comment."
+  color: "ffc7ea"
+- name: "Category: Bug 🐛"
+  color: "ffc7ea"
+  from_name: "bug"
+- name: "Category: Investigation 🔍"
+  color: "ffc7ea"
+- name: "Category: CI ⛓️"
+  description: "Anything related to continuous integration"
+  color: "ffc7ea"
+- name: "Category: Testing 🧪"
+  description: "Unit tests, integration tests, etc."
+  color: "ffc7ea"
+- name: "Category: Code quality ✏️"
+  color: "ffc7ea"
+- name: "Category: Performance 🚀"
+  color: "ffc7ea"
+- name: "Category: Label missing ❗"
+  description: "Use this if it feels a label should be added to label this issue"
+  color: "ffc7ea"
+
+# Status
+- name: "Status: 🗯️ Waiting for feedback"
+  color: "f7d692"
+- name: "Status: 🔴 Blocked"
+  color: "f7d692"
+  description: "Blocked by another issue or pull request"
+- name: "Status: 🟡 Nearly resolved"
+  color: "f7d692"
+  description: "This might be resolved or is about to be resolved"
+
+# Priority
+- name: "Priority: 🚨 Urgent"
+  color: "03adfc"
+- name: "Priority: 📌 Before next release"
+  color: "03adfc"
+  description: "Has to be done before the next release"
+- name: "Status: 🔒 After next release"
+  color: "03adfc"
+  description: "Will be done after the next release"
+- name: "Priority: 💤 Low priority"
+  color: "03adfc"
+
+# Complexity
+- name: "Complexity: 🟥 Hard to do"
+  color: "ff9efc"
+- name: "Complexity: 🟦 Easy to do"
+  color: "ff9efc"
+
+# Closing reason
+- name: "Closed: 👥 Duplicate"
+  color: "959a9c"
+  description: "Issue duplicates an existing issue"
+- name: "Closed: ⚰️ Inactive"
+  color: "959a9c"
+  description: "No answer was received for weeks"
+- name: "Closed: 🙅 Won't fix"
+  color: "959a9c"
+- name: "Closed: 🧺 Invalid"
+  color: "959a9c"

.github/workflows/labels.yml

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+name: labels
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - .github/labels.yml
+      - .github/workflows/labels.yml
+  pull_request: # dry run only
+    paths:
+      - .github/labels.yml
+      - .github/workflows/labels.yml
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      issues: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: crazy-max/ghaction-github-labeler@v5
+        with:
+          dry-run: ${{ github.event_name == 'pull_request' }}