[FEATURE] Add JWE + JWS Encryption/Decryption Layer in data APIs

[Nishant Joshi]

Description

The purpose of this task is to make the communication with the locker encrypted end-to-end, as a prerequisite for PCI-DSS certification.

Work Involved

• Create/Test the JWE + JWS algorithm, with support for multiple key_ids
• Create a middleware to perform encryption and decryption of request body for data API calls.
• Add support for multi-tenant look for the public key.