(refactor): prepare breaking v2 API

- rename package to sneklog and move module to /v2
- replace text output flags with writer formatters
- remove external color dependencies
- update migration notes and coverage

.gitea/workflows/go-lint.yaml

@@ -0,0 +1,12 @@
+name: Golang lint
+run-name: Linting code
+on: [push]
+
+jobs:
+  lint:
+    runs-on: go-latest
+    steps:
+      - name: Checkout repository code
+        uses: actions/checkout@v6
+      - name: Run golangci-lint
+        run: golangci-lint run