Allow continuous batching to be disabled

[ibehnam]

68e210b enabled continuous batching by default, but the server would still take the -cb | --cont-batching to set the continuous batching to true. I turned those args to -nocb | --no-cont-batching so we can disable this behavior in server.

[phymbert]

What is the motivation to disable continuous batching?

[phymbert]

Please update the Readme and related tests

[github-actions]

📈 llama.cpp server for bench-server-baseline on Standard_NC4as_T4_v3 for phi-2-q4_0: 557 iterations 🚀

Expand details for performance related PR only

• Concurrent users: 8, duration: 10m
• HTTP request : avg=8399.19ms p(95)=20545.17ms fails=, finish reason: stop=495 truncated=62
• Prompt processing (pp): avg=97.95tk/s p(95)=454.09tk/s
• Token generation (tg): avg=33.27tk/s p(95)=48.25tk/s
• ggml-org/models/phi-2/ggml-model-q4_0.gguf parallel=8 ctx-size=16384 ngl=33 batch-size=2048 ubatch-size=256 pp=1024 pp+tg=2048 branch=master commit=472a9b8be53dba6864411327c64f5fdd636c2196

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