transaction-fuzzer: add address-balance and gasless fuzz tests

[alex-mysten]

Summary

• Adds two new sim-test fuzzers under crates/transaction-fuzzer/tests/transaction_data_fuzz.rs:
  • fuzz_addr_balance — exercises the implicit-gas address-balance flow with composed valid PTs (transfer, clock, randomness, balance/coin send, FundsWithdrawal, coin reservations) and a garbage-PT arm that drives the validator rejection paths.
  • fuzz_gasless — exercises gasless transactions (budget=0, no payment) with composed PTs of allow-listed framework calls (balance::redeem_funds, balance::split, coin::redeem_funds, coin::into_balance, coin::put, funds_accumulator::withdrawal_split) plus coin-reservation inputs.
• New addr_balance_fuzzer module factored into common.rs, coin_reservation.rs, addr_balance.rs, gasless.rs. Both flows share TxFuzzContext, expiration, and coin-reservation strategies.
• Adds proptest_derive::Arbitrary (gated on feature = "fuzzing") for the types reachable from any::<ObjectArg>()/any::<ChainIdentifier>()/any::<Argument>() so the garbage strategies can drive those decoders directly.
• Each fuzz iteration submits a real transaction against a TestEnvBuilder cluster, dual-signs sponsored variants when sender != gas_owner, classifies the result, and asserts a minimum result-distribution depth so a strategy regression that collapses into a single category fails the test.

Both tests rely on the default protocol version (119+ on non-mainnet) which already enables enable_gasless, enable_coin_reservation_obj_refs, and enable_address_balance_gas_payments, so no proto-config overrides are needed.

Test plan

• cargo simtest --no-capture -p transaction-fuzzer fuzz_addr_balance
• cargo simtest --no-capture -p transaction-fuzzer fuzz_gasless
• cargo xclippy -D warnings
• cargo fmt --all

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