feat: executor, testing utilities, and improved tests #104

Job	Run time
Rustfmt	14s
cargo test (gadget-blueprint-proc-macro)	5m 3s
cargo clippy	3m 49s
cargo test (gadget-blueprint-proc-macro-core)	4m 33s
cargo test (gadget-context-derive)	5m 38s
cargo test (gadget-client-eigenlayer)	3m 22s
cargo test (gadget-client-evm)	3m 29s
cargo test (gadget-client-tangle)	2m 37s
cargo test (gadget-crypto-sp-core)	1m 49s
cargo test (gadget-crypto-ed25519)	1m 16s
cargo test (gadget-crypto-bls)	1m 16s
cargo test (gadget-crypto-k256)	1m 27s
cargo test (gadget-crypto-sr25519)	1m 11s
cargo test (gadget-event-listeners-core)	1m 0s
cargo test (gadget-event-listeners-evm)	1m 19s
cargo test (gadget-event-listeners-cronjob)	52s
cargo test (gadget-event-listeners-tangle)	2m 26s
cargo test (gadget-blueprint-serde)	1m 48s
cargo test (gadget-config)	1m 21s
cargo test (gadget-executor)	35m 0s
cargo test (gadget-keystore)	3m 40s
cargo test (gadget-std)	56s
cargo test (gadget-utils-tangle)	1m 54s
cargo test (gadget-networking)	2m 39s
	1h 28m 39s

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