Remove unused `AsyncHooksContextManager`

[dyladan]

          Also consider remove `AsyncHooksContextManager` because it will no longer be used.

Originally posted by @dyladan in https://github.com/open-telemetry/opentelemetry-js/issues/3720#issuecomment-1823194259

No longer used in SDK 2.0 so it can be safely removed.

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[pichlermarc]

@dyladan I'm currently refining issues, one question:

• should we rename the package @opentelemetry/context-async-hooks to @opentelemetry/context-async-local-storage as it'll be the only context manager that's left in that package?

If yes, then I think we can break this down into multiple subtasks:

• [ ] change all usages of AsyncHooksContextManager to AsyncLocalStorageContextManager
• [ ] PENDING: rename package to @opentelemetry/context-async-local-storage
• [ ] integrate abstract base AbstractAsyncHooksContextManager into AsyncLocalStorageContextManager