Clear storage cache if the sdk versions or the instances are different

Description

When creating a new "Client" object, we check in the storage if there're some irrelevant acc.js.sdk cache items: containing other sdk versions or cache for other instances.

Related Issue

Motivation and Context

in the case of using localStorage, whose size is limited to 5Mb, the irrelevant caches take space

How Has This Been Tested?

A unit test has been added

Screenshots (if appropriate):

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

[x] I have signed the Adobe Open Source CLA.
[x] My code follows the code style of this project.
[ ] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[ ] I have read the CONTRIBUTING document.
[ ] I have added tests to cover my changes.
[x] All new and existing tests passed.

adobe / acc-js-sdk

Clear storage cache if the sdk versions or the instances are different #66