Support added for speculation aggressiveness parameter for explicit chains

Reduced complexity of the speculative deployer. Moved path discovery to orchestrator. Removed need to recalculate path on each run

Support added for deployment aggressiveness parameter for implicit chains

Added support for JIT deployment of implicit chains. Primary testing done

Added support for measurement of call delays in implicit function chains

Reverted Prometheus related changes as unstable VPN made it hard to test them, will implement later when college starts

Added instrumentation to measure worker idle time before it receives its first request. 
Also added flags related to JIT deployment

Support is only for non-conditional chains.

Moving metrics handling to Prometheus from swagger stats.

Better support for different runtimes added

Conditional chain support added for Explicit chains. This introduces probabilistic chain support to Xanadu.

Added support to save long term metrics to couchDB