feat: experimental support for browser (#1213)

.changeset/six-cameras-play.md

.github/workflows/test.yml

packages/autotool/package.json

packages/env/package.json

packages/env/src/index.browser.ts

packages/env/src/index.edge-light.ts

packages/env/src/index.ts

packages/env/src/index.workerd.ts

packages/env/src/node-polyfill.ts

packages/env/src/utils/index.ts

packages/env/src/utils/index.web.ts

packages/env/src/web-polyfill.ts

...es/llamaindex/e2e/examples/llama-parse-browser/.gitignore

...es/llamaindex/e2e/examples/llama-parse-browser/index.html

.../llamaindex/e2e/examples/llama-parse-browser/package.json

...s/llamaindex/e2e/examples/llama-parse-browser/src/main.ts

...llamaindex/e2e/examples/llama-parse-browser/src/style.css

...aindex/e2e/examples/llama-parse-browser/src/vite-env.d.ts

...llamaindex/e2e/examples/llama-parse-browser/tsconfig.json

...lamaindex/e2e/examples/llama-parse-browser/vite.config.ts