Lru caching

[AmanSal1]

All Submissions:

• Have you followed the guidelines stated in CONTRIBUTING.md file?
• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update

New Feature Submission:

• Does your submission pass the tests?
• Have you linted your code locally prior to submission?

Changes To Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

After these steps, you're ready to open a pull request.

a. Give a descriptive title to your PR. 
Addition of LRU Caching 

b. Describe your changes.
 LRU Caching using third party libraries and adding the associated test case for it .

c. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such).
Fixes: 

#3021

[AmanSal1]

@ElijahAhianyo I accidently committed in the same branch . I have changed only state.py and test_state.py .

[Lendemor]

This PR is removing upload.py when it shouldn't.

We won't be able to merge it until the changes to upload.py are removed from the PR.

[AmanSal1]

@Lendemor Just a demo PR, need not be merged