rust

Revise and reorganize "Why the Component Model?" section #54

Job	Run time
build (component-model/examples/tutorial/adder, component)	17s
build (component-model/examples/example-host)	41s
build (component-model/examples/tutorial/calculator, component)	16s
build (component-model/examples/tutorial/command, component)	21s
	1m 35s

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