Origin key api

[Neylix]

Description

A new origin_key API is available. It permit to get the encrypted secret and encrypted secret key of the origin shared secrets encrypted by the public key passed threw request params.

Fixes #158

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Test files
• Launch the netwrok which create a random origin shared secrets encrypted by the hardcoded origin public key in config file, used this public key with the API and get the JSON content expected

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Neylix]

For test and development, I used code added in #288
last commit is for this implementation (782d403)

[ghost]

Good PR 👍, just few comments to improve it