Support send startup params to cloud-hypervisor through api-socket

[xietuo]

What would you like to be added?

Support run cloud-hypervisor with minimal cmdline param, like "api-socket ", then use api-socket request to send startup params.

Why is this needed?

1. cloud-hypervisor community has changed the format of command-line options several times in recent releases. Affected Kuasar cmdline parameters implementations.
2. pre-starting cloud-hypervisor process, may improve the startup performance.