[ESI] List support in data windows

[teqdruid]

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[Copilot]

Pull Request Overview

This PR adds support for ESI list types within data windows, enabling variable-length data to be transmitted through window frames. The implementation extends the existing window mechanism to handle lists similarly to arrays, with special handling for the "last" signal and size fields.

Key Changes

• Extended window type validation and lowering to support list fields alongside arrays
• Added canonicalization patterns for wrap/unwrap window operations
• Updated documentation to clarify list behavior in windows (single element or fixed-size chunks)

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/Dialect/ESI/windows.mlir	Added comprehensive tests for list support in windows, including single-element and multi-element list windows, and channel integration tests
test/Dialect/ESI/errors.mlir	Updated error tests to reflect new validation rules for arrays and lists with numItems specification
lib/Dialect/ESI/ESITypes.cpp	Implemented validation and lowering logic for list types in windows, including special handling for "last" signal and size fields
lib/Dialect/ESI/ESIOps.cpp	Updated WrapWindow operation to accept generic Type instead of only UnionType
lib/Dialect/ESI/ESIFolds.cpp	Added canonicalization pattern for WrapWindow to optimize wrap-unwrap chains
lib/Dialect/ESI/Passes/ESILowerTypes.cpp	Integrated canonicalization pass for window operations using createOrFold for materializations
lib/Dialect/ESI/Passes/ESILowerToHW.cpp	Added WrapWindow and UnwrapWindow as legal operations in ESI-to-HW lowering
include/circt/Dialect/ESI/ESIChannels.td	Updated documentation for list support in windows and changed return type of getLoweredType to Type
lib/Bindings/Python/support.py	Added ListType handling in type_to_pytype function
frontends/PyCDE/test/test_esi.py	Added test case for List type usage in PyCDE modules
frontends/PyCDE/src/pycde/types.py	Fixed _get_value_class to be a method (removed @Property decorator) for consistency
frontends/PyCDE/src/pycde/system.py	Added lower-esi-types pass to the compilation pipeline
frontends/PyCDE/src/pycde/signals.py	Updated type annotation to use modern Python 3.10+ syntax (Type

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