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Improve the errors that result when a aggregate type is not supported #201

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@alamb

Note: migrated from original JIRA: https://issues.apache.org/jira/browse/ARROW-12319

When you try and run a query such as

{code}
select AVG(ts_colum) from t;
{code}

where ts_column has DataType::Timestamp type, you get a pretty unintelligible error message

"Coercion from [Timestamp(Nanosecond, None)] to the signature Uniform(1, [Int8, Int16, Int32, Int64, UInt8, UInt16, UInt32, UInt64, Float32, Float64]) failed."

This error should be improved to say something more like "AVG is not supported for {datatype} try an explicit cast."

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