* Initial plan
* Add advanced sequence operations to C# API
- Add MkSeqMap: Map function over sequence
- Add MkSeqMapi: Map function over sequence with index
- Add MkSeqFoldLeft: Fold left operation on sequence
- Add MkSeqFoldLeftI: Fold left with index on sequence
These functions match Python's SeqMap, SeqMapI, SeqFoldLeft, and SeqFoldLeftI and provide feature parity with other language bindings.
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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