Make trait functions that have default implementations callable #370

Job	Run time
collect-examples	17s
test-example (events)	2s
test-example (cross_contract/contract_a)	1s
test-example (increment_with_pause)	5m 0s
test-example (mint-lock)	1s
test-example (pause)	2s
test-example (increment)	3s
test-example (cross_contract/contract_b)	2s
test-example (increment_with_fuzz)	2s
test-example (simple_account)	2s
test-example (deep_contract_auth)	2s
test-example (custom_types)	1s
test-example (multisig_1_of_n_account/contract)	5m 0s
test-example (deployer/contract)	5m 0s
test-example (deployer/deployer)	2s
test-example (bls_signature)	2s
test-example (import_ark_bn254)	2s
test-example (auth)	1s
test-example (alloc)	5m 1s
test-example (liquidity_pool)	2s
test-example (atomic_multiswap)	2s
test-example (other_custom_types)	2s
test-example (fuzzing)	5m 0s
test-example (upgradeable_contract/old_contract)	3s
test-example (timelock)	2s
test-example (privacy-pools/contract)	2s
test-example (atomic_swap)	2s
test-example (ttl)	2s
test-example (token)	2s
test-example (hello_world)	3s
test-example (logging)	3s
test-example (single_offer)	2s
test-example (privacy-pools)	1s
test-example (groth16_verifier)	3s
test-example (account)	2s
test-example (eth_abi)	3s
test-example (merkle_distribution)	2s
test-example (upgradeable_contract/new_contract)	2s
test-example (errors)	2s
	26m 25s

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