Use commons 3.0.6; MemoryOnlyConfigurationStore without LRU

[leoromanovsky]

Fixes: #issue

Motivation and Context

Updates to commons 3.0.6 which contains new interfaces for the configuration store and the MemoryOnlyConfigurationStore which has an in-memory ServingStore and no PersistenceStore.

Description

• Removes un-needed files in this repository
• Switches from an LRU-based configuration cache to holding all in memory - https://github.com/Eppo-exp/js-client-sdk-common/blob/v3.0.6/src/configuration-store/memory.store.ts#L27

Follow-ups

Add a configuration parameter to this SDK to allow customers to provide a custom implementation of a PersistenceStore: IAsyncStore

How has this been tested?