Extend pull lambda out for conditional expression

[feilong-liu]

Description

Try to extract independent expressions from the conditional expressions.

Motivation and Context

In current code, when the expression is in a conditional expression, we will skip them. For example, for transform(col1, x -> if(col3 > 2, col2[2], 0)), we will skip and do not extract anything from the lambda expression. We chose this behavior because expressions in conditional expressions may not be executed.
However, some part of the conditional will always be evaluated, for example in the above expression transform(col1, x -> if(col3 > 2, col2[2], 0)) we can extract col3>2 out, as it's a condition and will always be evaluated. In this PR, I extend the optimizer to extract these expressions.

Impact

Increase the coverage of this optimizer.

Test Plan

Unit test and verifier run test

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Release Notes

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== RELEASE NOTES ==

General Changes
* Fix lambda expression pull out optimizer so that it will be able to extract independent expressions from conditional expression.

[ajaygeorge]

Stamping since it is already reviewed.