Fix bugs with v2 config parser

[bentsherman]

This PR fixes a few issues I encountered while testing the v2 config parser against some nf-core configs

• make sure config file passes its params to included configs
• make sure profiles are evaluated only if they were enabled, to prevent unnecessary config inclusions (for example)
• factor out DSLs for plugins, process, and profiles block to make the code easier to read

This PR should ideally be merged before the next edge release, so that the v2 config parser is usable by nf-core

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