[RFC] Support Lora management in kubernetes native way

[Jeffwan]

After the interview discussion, we determine to create custom resource for Lora Adapters. We need to create the api and controllers for it. Detail design will come soon

• Create the API and controller skeleton Create Lora api and controller #23
• Design the Lora API
• Implement the Lora controllers Part I (Service & Endpoint slice controller)
• Implement the Lora controllers Part II (Interact with inference engine for loading)
• Finish the routing algorithm design and implementation
• Design and implement cold start manager
• Design and implement the lora scheduler
• Engine related changes Improve Lora management quality to production grade #14

[Jeffwan]

We leave some advanced features like cold start manager and lora scheduler to v0.2.0. We have enough feature coverage in v0.1.0.
#303 #304 #305 have been created to track unfinished items