refactor(sdk): Simplify CacheAsyncFn

[teogeb]

Simplify sdk's CacheAsyncFn utility function API. No functionality changes.

Changes

• rm onEviction option (not used)
• rm cachePromiseRejection (always false)
• all opts params are required
• use new MapKey type
• use Promise instead of PromiseLike

Style

• renamed caches.ts toCacheAsyncFn.ts
• moved tests from promises.test.ts to CacheAsyncFn2.test.ts (as there is already CacheAsyncFn2.test.ts)
  • some @ts-expect-error functionality was removed (see commit 500fbca)

Future improvements

• Could improve the naming of the function and/or implement it as a class?
• Merge CacheAsyncFn2.test.ts and CacheAsyncFn2.test.ts