SIT-2037 Add support for `com.snowflake.snowpark.Row.getAs` function

[sfc-gh-fgonzalezmendez]

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1. What GitHub issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SIT-2037

2. Fill out the following pre-review checklist:

   • [X] I am adding a new automated test(s) to verify correctness of my new code
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   • [ ] I am adding a new dependency

3. Please describe how your code solves the related issue.

   It adds a new function to the Row class that returns the value at the specified column index and casts it to the desired type.

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[sfc-gh-fgonzalezmendez]

I see this PR missed structured types and timestamp types, what is the plan to support them?

@sfc-gh-bli Can you explain in more detail which scenarios are not covered yet with this implementation, please?

For example, calling the function row.getAs[Timestamp](0) will have the same behaviour as calling the function row.getTimestamp(0). Inside, those two functions will just call get(index).asInstanceOf[T]

val schema = StructType(StructField("c1", TimestampType))
val data = Seq(Row(new Timestamp(System.currentTimeMillis())))
val row = session.createDataFrame(data, schema).collect()(0)
row.getAs[Timestamp](0) == row.getTimestamp(0) // true

Regarding the structured types, I think it is similar to the above scenario. Those types will fall in the default case: get(index).asInstanceOf[T].