add initial command integration to jdl

[mshima]

• move more utilities to lib.

Related to #27135.

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[mshima]

The error happens due to #27136.
We have JDL dependency on parsing JDL definition from command, that depends on Generators for callbacks, that depends on JDL.

JDL -> command -> Generator -> JDL circular dependency cause a module to be re-loaded before it was initialized cause it to be undefined.