Trigger Alkane sites deployments from CLI or HTTP API

Summary:
"Crack hydrocarbons to build C2H6"

Alkane is the new Nasqueron PaaS to host static and PHP sites.

This utility allows to deploy a site to the Alkane PaaS.

It's intended to be a glue code between Jenkins and Salt, so:

• the same state is reached, whatever which one initiates the deployment
• no vendor locking with the Salt event bus
• agnostic for CI/CD platform, no vendor locking with Jenkins
• avoid to give Jenkins agents a SSH access

Ref T1826

Test Plan:

• Tests are provided
• A Postman collection has been prepared for the HTTP API
• Build on FreeBSD with nighly toolchain

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1826

Differential Revision: https://devcentral.nasqueron.org/D2983