Require each module once during the build in order to avoid syntactical errors in runtime

[drobiazko]

• iterate through all triggers/actions
• require the main module of the current trigger/action
• collect all the errors
• report them all together

[jhorbulyk]

Another validation to add:

• If an action/trigger has "dynamicMetadata": true then that action/trigger must have a getMetaModel method.