Add Payload Feature Flags plugin with custom endpoints and configurations

.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+.yarn/install-state.gz
+
+/.idea/*
+!/.idea/runConfigurations
+
+# testing
+/coverage
+
+# next.js
+.next/
+/out/
+
+# production
+/build
+/dist
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+
+.env
+
+/dev/media
+
+# Playwright
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache/