Add caseflip extension

extensions/caseflip/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# Raycast specific files
+raycast-env.d.ts
+.raycast-swift-build
+.swiftpm
+compiled_raycast_swift
+compiled_raycast_rust
+
+# misc
+.DS_Store

extensions/caseflip/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/caseflip/CHANGELOG.md

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+# CaseFlip Changelog
+
+## [Initial Version] - {PR_MERGE_DATE}

extensions/caseflip/README.md

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+# CaseFlip
+
+Flips lowercase letters to uppercase and vice versa.
+
+# How to use CaseFlip
+
+1. Copy your text to flip
+2. Run CaseFlip
+3. Your CaseFlipped text is automatically pasted and in the clipboard
+
+# Recommendation
+
+Set a hot key like cmd + shift + V to quickly copy and (shift) paste your CaseFlipped text.

extensions/caseflip/eslint.config.js

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+const { defineConfig } = require("eslint/config");
+const raycastConfig = require("@raycast/eslint-config");
+
+module.exports = defineConfig([
+  ...raycastConfig,
+]);