Finalizes 4.0.0 & 5.1.0 from #8364

• Parse commands and options as provided via external plugins. For that, needed to move lifecycleEvents configuration to config schema, as it's crucial in detecting which AWS provider commands were adapted in context of other provider (note in such cases other provider doesn't have to configure command explicitly, it's enough that it attaches some function to pre-configured command lifecycle events)
• Finalize resolution of opt variable source (after having all commands schema resolved, last resolution phase was configured to resolve any final properties behind opt sources)
• Having all commands data, validate unrecognized command in context of main script. Additionally validate unrecognized options, signalling that with next major such usage will throw
• Maintenance improvements to main process file

It's needed to be able to process commands as introduced by plugins without a need of processing Serverless instance

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