Core tasks missing features

[kanej]

The tasks part of ./v-next/core needs functionality filled out around the building up of task definitions and running the tasks.

TODO

• Complete the implementation of and test the TaskDefinition builders
• Implement and test the ResolvedTask#run method, which runs the tasks
• Polish and test the TaskManager
• add simple builder for empty task #5302
• Remove functions from v-next/core/src/types/common.ts #5303
• move formatParameterValue/parseParameterValue and isParameterValueValid to a util #5304
• Add a way to retrieve top level tasks in the TaskManager #5333
• Add validation for positional parameter clashes in TaskManager #5335
• Check for missing dependencies using detectPluginNpmDependencyProblems in the ResolvedTask#run method when failing to import a file action.