Add support for last_value window function

[Ulimo]

This fixes #779

[Copilot]

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Comments suppressed due to low confidence (1)

src/FlowtideDotNet.Core/Compute/Columnar/Functions/WindowFunctions/LastValueWindowFunction.cs:70

• [nitpick] Consider renaming the variable 'lowerPreceedingRow' to 'upperPreceedingRow' (or another indicative name) in the upper bound branch to more clearly reflect its purpose.

if (windowFunction.UpperBound is PreceedingRowWindowBound lowerPreceedingRow)

[github-actions]

Benchmark

Benchmark suite	Current: a188edb	Previous: 22d4209	Ratio
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.InnerJoin	401505640 ns (± 8274693.0679834485)	458826533.3333333 ns (± 10640413.19005047)	0.88
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.LeftJoin	483420244.4444444 ns (± 16873796.696217414)	564994640 ns (± 28550338.329818636)	0.86
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ProjectionAndNormalization	144890200 ns (± 21013864.607563265)	169842820 ns (± 7144067.768715523)	0.85
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.SumAggregation	164302300 ns (± 7067309.701364445)	171581250 ns (± 12415362.812660772)	0.96
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ListAggWithMapAggregation	1791120840 ns (± 127588427.51687899)	1982296640 ns (± 123349811.75190067)	0.90
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.WindowSum	369399910 ns (± 9807379.570756344)
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ListAggWithStructAggregation	1480901130 ns (± 79240914.24384318)

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