Catch Local Storage Full

[korgon]

We are currently not catching when the storage gets full - this generates an error. Storage is used in many places, but the most important is the client cache, this would break search completely.

May want to check for other core usage, but we should at least ensure that a full local storage does not cause issues in:

• snap-client
• StorageStore

Ideally tests would be written first followed by changes to the code to get the tests to pass.