feat: executor, testing utilities, and improved tests #121

Job	Run time
cargo clippy	1m 11s
Rustfmt	23s
cargo test (gadget-blueprint-proc-macro)	4m 46s
cargo test (gadget-blueprint-proc-macro-core)	4m 48s
cargo test (gadget-context-derive)	4m 48s
cargo test (gadget-client-eigenlayer)	4m 32s
cargo test (gadget-client-evm)	2m 4s
cargo test (gadget-client-tangle)	2m 18s
cargo test (gadget-crypto-sp-core)	1m 29s
cargo test (gadget-crypto-ed25519)	46s
cargo test (gadget-crypto-bls)	1m 9s
cargo test (gadget-crypto-k256)	51s
cargo test (gadget-crypto-sr25519)	56s
cargo test (gadget-event-listeners-core)	50s
cargo test (gadget-event-listeners-evm)	2m 28s
cargo test (gadget-event-listeners-cronjob)	1m 8s
cargo test (gadget-event-listeners-tangle)	2m 36s
cargo test (gadget-blueprint-serde)	1m 49s
cargo test (gadget-config)	1m 9s
cargo test (gadget-executor)	4m 45s
cargo test (gadget-keystore)	3m 43s
cargo test (gadget-std)	53s
cargo test (gadget-utils-tangle)	2m 7s
cargo test (gadget-networking)	3m 11s
	54m 40s

Provide feedback