handle storing local data in the in-memory state

[shazron]

          keeping `local=false` in this PR works as it aligns with the current behavior. see [here](https://github.com/adobe/aio-lib-ims/blob/master/src/ctx/Context.js#L87-L89) and [here](https://github.com/adobe/aio-lib-ims/blob/master/README.md?plain=1#L114)

note
In the future or as an extra effort, we may store the local information when setting the token in-memory to return it here. e.g. by storing it in smthg like this.isLocal[this.keyNames.CONTEXTS][key]. This will provide an option to just cache in-memory (not using State lib), in the context of I/O Runtime actions.

Originally posted by @moritzraho in #150 (comment)