Fix array element type mapping #175
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WHAT
Make mapped type of array elenment nullable. For example,
ARRAY<INT64>will be[]spanner.NullInt64instead of[]int64.In addition, I updated go version to pass CI.
WHY
In spanner, array elements are always nullable, but current yo implementation treats them as non null. In fact, SQL driver for Spanner maps array types to
[]spanner.NullXxxtypes, sosql.Rows.Scan()fails withunsupported Scan, storing driver.Value type []spanner.NullInt64 into type []int64.