Bzl should be split onto daemon and client

[konste]

Right now Bzl is the application - you can start it from the command line and the console stays locked until Bzl finishes (or gets killed). Please consider mimicking Bazel approach when "bazel" command fires up background process (if it is not yet running) and delegates the work to that process. Then Bzl command would return to console right after the command is sent to the server. For example I visualize client commands such as

bzl cache start
bzl cache shutdown
bzl cache dump (for debugging)
bzl cache stats
etc.

[konste]

I really want to differentiate Bzl service (daemon) and Bzl client (GUI, command line, whatever).
Bzl client should delegate the work to service and return control immediately unless it is intentionally used for some long running operation such as displaying ongoing status, statistics, etc.