add a [DebuggerDisplay] attribute to show necessary information on the debugger

[ArcturusZhang]

Description

with the attribute, when debugging, we could see some information for the type provider:

before this change, the debugger is only showing the type which usually is useless.

The attribute is now applied to:

• TypeProvider
• Languages which contains the name of a schema in code model
  

Checklist

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