Allow * character for schemas and warn about performance impact

When configuring a list tab or a search item in the drawer, setting * as the value for schemas results in an error message that the schemas field is empty. This is wrong and confusing.

• create a page provider in modeler and keep the default settings
• click on "Configure layouts in Designer →"
• generate the result form
• go to tabs
• click on + listing
• set the page provider name
• set schemas to *
• set search-name
• save
  ==> there is an error message "The attribute "schemas" cannot be empty."

AC
In

• tabs / listings
• drawer items / search
• drawer menus / listing
• When using the nuxeo-results-view or nuxeo-search-form as a custom element and * for schemas value

I can use the * value for the schemas parameters.
When doing so

• a warning is issued

  Using * for schemas will retrieve all of them and may impact performances.

• designer does not issue the warning: The "*" schema is not defined as currently