Walker allows atom and integer key access

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📥 Commits
Files that changed from the base of the PR and between c8466b899d043673e9af71fa87e1ca07dcbfbe1f and 58c0c18b3d061fd4dfa638e933714853f6ad618d.

Walkthrough

This pull request introduces several changes across multiple modules in the Beaver project. A new implementation of the String.Chars protocol is added to the Beaver.MLIR.StringRef module, enabling string conversion. The Beaver.Walker module's fetch/2 function is enhanced to handle multiple element types more flexibly, with updated pattern matching and type safety improvements. Additionally, the Beaver.Dummy module's put_func function is modified to generate unique symbolic names using a different approach. A new test module is also added to validate the functionality of the Walker component.

Changes

File	Change Summary
lib/beaver/mlir/string_ref.ex	Added implementation of `String.Chars` protocol for `Beaver.MLIR.StringRef`, enabling string conversion.
lib/beaver/walker.ex	Modified `fetch/2` function to handle multiple element types, updated pattern matching and type safety.
test/support/dummy.ex	Changed `put_func` to generate symbolic names using `System.unique_integer()` instead of reference inspection.
test/walker_test.exs	Introduced `WalkerTest` module with tests for `Beaver.Walker` functionality, asserting operation attributes and types.

Possibly related PRs

#354: The changes in the Beaver.Walker module are related to the main PR as they both involve modifications to the same module, specifically the fetch/2 function, which is part of the broader functionality of the Walker component.

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beaver-lodge / beaver