Name variable & size in feedback of bad domain

[FlorianDeconinck]

When in a signature a FloatField is of the wrong size, we detect in gt4py.cartesian.stencil_object but the error is: Compute domain too large (provided: (X, X, X), maximum (X,X,X)

This is not enough for a quick debug because it doesn't give:

• The name of the stencil
• The name of the offending Field with a bad size
• A clear explanation of stencil domain vs Field sizes

Parent: #49

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• Enhance the feedback to make those error easily debuggable