This adds an Optimizely adapter for use with the flag() function.

It optimizes Optimizely (hah) for use with serverless/edge runtimes by offloading event dispatches to waitUntil() and sets up fetch() as a request handler instead of node https.

This is still a naive implementation where each individual event dispatch (if you're tracking experiments for the flag) gets added to waitUntil(). There's no batching or time based flushing happening for longer living instances.

The adapter has the following functions:

• decide() to decide on a feature flag, can be directly used as adapter
• (削除) userContext() which returns a user context interface so users can track events for example, more of a helper function (削除ここまで) Dropped this for now as I need to properly make it work with a deduped identify function
• initialize() to get an initialized Optimizely instance

Based off of #175 for now so I can import their universal SDK.

Extra notes:

• Was playing around with pnpm versions to link so I remade the lockfile a few times 🙈