Add support for list sort ascending null last

[Ulimo]

This fixes #768

[Copilot]

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• tests/FlowtideDotNet.ComputeTests/OtherCases/list/list_sort_asc_null_last.test: Language not supported

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tests/FlowtideDotNet.AcceptanceTests/ListTests.cs:194

• Consider adding test cases for scenarios where the input list contains null elements to fully validate the 'null last' behavior.

public async Task ListSortAscendingNullLast()

[github-actions]

Benchmark

Benchmark suite	Current: 5c06aad	Previous: 22d4209	Ratio
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.InnerJoin	414472220 ns (± 13513092.642059732)	458826533.3333333 ns (± 10640413.19005047)	0.90
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.LeftJoin	508955730 ns (± 26558048.394582763)	564994640 ns (± 28550338.329818636)	0.90
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ProjectionAndNormalization	161405790 ns (± 10719172.542012954)	169842820 ns (± 7144067.768715523)	0.95
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.SumAggregation	164420720 ns (± 15397756.117968762)	171581250 ns (± 12415362.812660772)	0.96
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ListAggWithMapAggregation	1859301290 ns (± 123775921.92456496)	1982296640 ns (± 123349811.75190067)	0.94
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.WindowSum	384315790 ns (± 16104931.334804809)
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ListAggWithStructAggregation	1510746410 ns (± 48064196.372703224)

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