fix(dyn-abi): allow self-referential struct types in EIP-712 canonicalize (#1103)

[0xSoftBoi]

Summary

• EncodeType::canonicalize rejected recursive struct types such as Node(uint256 value, Node[] children) with MissingType("primary component"), even though EIP-712 states "The standard supports recursive struct types."
• Resolver::non_dependent_types treated a self-edge as making a type dependent on itself, so the primary component iterator came back empty and canonicalize errored out before any cycle check.

Fix

• non_dependent_types now ignores self-edges when computing the dependent set, so a self-referential type is still recognised as a non-dependent (primary) component.
• Cycle detection is split into a strict variant (used by Resolver::resolve, which builds a DynSolType and therefore cannot represent recursive types) and a permissive variant used by Resolver::linearize / Resolver::encode_type. Cycles between distinct types are still rejected on both paths.
• canonicalize no longer calls the redundant resolver.resolve(primary); encode_type already walks the dependency graph via linearize and surfaces missing-type and circular-dependency errors.

TypedData::eip712_signing_hash still returns CircularDependency for self-referential types because the encode_data path goes through resolve; only the encodeType / typeHash path becomes permissive. The existing test_hash_recursive_types continues to pass unchanged.

How it was tested

New tests (all pass; cargo fmt and cargo clippy -- -D warnings are clean):

• eip712::parser::tests::canonicalize_self_referential_type — the exact repro from the issue.
• eip712::parser::tests::canonicalize_self_referential_type_with_dependency — recursive primary with an extra leaf type.
• eip712::resolver::tests::non_dependent_self_referential_type_is_primary
• eip712::resolver::tests::encode_type_round_trip_self_referential
• eip712::resolver::tests::resolve_still_rejects_self_referential_types
• eip712::resolver::tests::encode_type_still_rejects_mutual_recursion

Pre-existing test_fails_encode_type_circular (mutual recursion through distinct types) and test_hash_recursive_types continue to pass.

Full cargo test -p alloy-dyn-abi --all-features: 194 passed; 0 failed.

Fixes #1103

[0xSoftBoi]

Friendly ping — this is approved and mergeable. Happy to rebase if needed, otherwise let me know if anything else is required before merge. Thanks!