deps: bump wasm-smith and enable fuzzers

[marxin]

Fixes: #5931

[Copilot]

Pull request overview

This PR bumps the wasm-smith dependency from version 0.4.4 to 0.243.0 and updates the fuzzer targets to work with the new API. The changes improve error messages by including type information and modernize the fuzzer configuration to use the newer wasm-smith Config API directly instead of the deprecated ConfiguredModule wrapper.

Key changes:

• Updates wasm-smith from 0.4.4 to 0.243.0, transitioning from the old Config trait to the new wasm_smith::Config struct API
• Enhances error messages in compiler backends to include type information for easier debugging
• Refactors fuzzer targets to use custom wrapper structs and updated wasm-smith configuration patterns

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Cargo.toml	Bumps wasm-smith version from 0.4.4 to 0.243.0
Cargo.lock	Updates transitive dependencies for wasm-smith and removes old indexmap versions
lib/compiler-singlepass/src/codegen.rs	Adds type information to the "unimplemented type" error message
lib/compiler-cranelift/src/func_environ.rs	Includes type debug information in the ref.null unsupported feature error
fuzz/fuzz_targets/universal_singlepass.rs	Refactors to use custom SinglePassFuzzModule wrapper with new wasm-smith Config API and adds save_wasm_file helper
fuzz/fuzz_targets/universal_llvm.rs	Refactors to use custom LLVMPassFuzzModule wrapper with new wasm-smith Config API and adds save_wasm_file helper
fuzz/fuzz_targets/universal_cranelift.rs	Refactors to use custom CraneliftPassFuzzModule wrapper with new wasm-smith Config API and adds save_wasm_file helper
fuzz/fuzz_targets/metering.rs	Simplifies to use wasm_smith::Module directly instead of custom wrapper
fuzz/fuzz_targets/equivalence_universal.rs	Removes custom wrapper and uses wasm_smith::Module directly, updates API calls for store/instance patterns
fuzz/fuzz_targets/deterministic.rs	Removes custom wrapper and uses wasm_smith::Module directly

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