Store & read in-memory cache on local disk

[Jandev]

When a Function stops running, the in-memory cache will also be cleared.

For us to have the least amount of hits to Cosmos DB, the cache can be stored & read from the local disk.
As proofed in this repository: https://github.com/Jandev/poc-scale-infinite-shared-state the state should be stored in:

Sharing date has to be done in the D:\home\data\-folder.

The state can be stored as a human-readable JSON document, called cache.json.
The contents will look like

{
    "entries": [
        {
            "slug": "the-slug",
            "fullUrl": "https://the-full-url/"
        }
    ]
}

Additional properties can be added when necessary, like an updatedOn.