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This PR sets up exports so that we can import in enterprise with just
"unleash-server".
This will free us to refactor unleash internals without breaking
enterprise
## About the changes
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### Important files
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## Discussion points
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* Fixes a memory leak where events would trigger the data polling to restart. Any event would setup another polling interval, which would strain our database. Separated the logic for fetching the data and the polling, and made sure that the polling was only initialized once.
* refactor: remove unused API definition routes
* feat: add support for proxy keys
* feat: support listening for any event
* feat: embed proxy endpoints
* refactor: add an experimental flag for the embedded proxy
