feat(icrc1): add ICRC-123 block schemas and ICRC-153 endpoint types

[bogwar]

Summary

• Add ICRC-123 block schema validators for 4 freeze/unfreeze block types (123freezeaccount, 123unfreezeaccount, 123freezeprincipal, 123unfreezeprincipal) with account-array and principal-blob target predicates
• Add ICRC-153 Candid types: args (FreezeAccountArgs, etc.), error enums, and paginated list request/response types
• Extend Transaction struct with freeze_account, unfreeze_account, freeze_principal, unfreeze_principal optional fields and constructors
• Fix downstream struct literals for new Transaction fields (index-ng tests, nervous_system, sns)

Stacked on #4321 (ICRC-124/154). First PR in the ICRC-123/153 freeze/unfreeze series.

Test plan

• //packages/icrc-ledger-types:test — schema validator unit tests pass
• //rs/ledger_suite/icrc1:icrc1_unit_test — downstream compilation verified
• cargo clippy clean

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds ICRC-123/153 freeze/unfreeze support to the shared ledger types layer by introducing block schema validators, new Candid endpoint argument/error/listing types, and extending the ICRC-3 Transaction representation to carry freeze/unfreeze actions.

Changes:

• Added ICRC-123 schema validators (and unit tests) for 4 new freeze/unfreeze block types.
• Added ICRC-153 Candid types for freeze/unfreeze arguments, error enums, and frozen-entity list request/response types.
• Extended icrc3::Transaction with optional freeze/unfreeze fields and updated downstream struct literals to include the new fields.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rs/sns/governance/token_valuation/src/tests.rs	Updates Transaction struct literals in tests to include new optional freeze/unfreeze fields.
rs/nervous_system/initial_supply/src/tests.rs	Updates Transaction struct literals in tests to include new optional freeze/unfreeze fields.
rs/ledger_suite/icrc1/src/endpoints.rs	Initializes new Transaction freeze/unfreeze fields to None when converting from blocks.
rs/ledger_suite/icrc1/index-ng/tests/tests.rs	Updates Transaction expectations to include new optional freeze/unfreeze fields.
packages/icrc-ledger-types/src/lib.rs	Exposes new icrc123 and icrc153 modules from the crate root.
packages/icrc-ledger-types/src/icrc3/transactions.rs	Adds ICRC-123 transaction kind constants, action structs, new Transaction fields, and constructors.
packages/icrc-ledger-types/src/icrc153/mod.rs	Introduces ICRC-153 Candid types for freeze/unfreeze args, errors, and list request/response types.
packages/icrc-ledger-types/src/icrc123/schema.rs	Adds schema validators + tests for ICRC-123 freeze/unfreeze block formats.
packages/icrc-ledger-types/src/icrc123/mod.rs	Adds module entrypoint for ICRC-123 schema module.

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