software to manage lifecycle of spacemesh components

[dshulyak]

in existing setup smapp manages spacemesh lifecycle, it has a few downsides:

• node can't be upgraded without updating smapp
• it is hard to use smapp with node that is not managed by smapp (not talking about wallet mode)
• smapp heuristic for node liveness is suboptimal
• it is not future proof, as we will have more than one component

as such the goal of this proposal is to write a software that will:

• daemonize and run components - node / post service / vm binaries
• provide API for smapp / other clients to check components liveness
• provide API to check upgrades
• execute upgrade for individual components (possibly in a sophisticated manner, such that stop nodes at specific layers)

[dshulyak]

it will be very required before vm is integrated as it will be running in a separate binary. it is also beneficial for #259 , even if it is integrated directly into go-spacemesh for time being.

[dshulyak]

one of the features that we need is to get logs automatically spacemeshos/go-spacemesh#4085