✨ encryption Add support for encrypting content using hybrid RSA/AES encryption

[joshjennings98]

Description

This change provides a method of encrypting a payload using hybrid RSA AES encryption. The payload itself is encrypted with the AES key which is fast but symmetric meaning both parties require the key. Therefore the key is encrypted with asymmetric RSA encryption and the encrypted key is included in the payload itself. RSA is not efficient on larger payloads so this method allows for fast encryption whilst also being asymmetric.

Information on hybrid RSA/AES encryption can be found here https://www.ijrar.org/papers/IJRAR23B1852.pdf

Test Coverage

• This change is covered by existing or additional automated tests.
• Manual testing has been performed (and evidence provided) as automated testing was not feasible.
• Additional tests are not required for this change (e.g. documentation update).