feat: executor, testing utilities, and improved tests #78

Job	Run time
Rustfmt	15s
cargo clippy	3m 2s
cargo test (gadget-blueprint-proc-macro)	1m 45s
cargo test (gadget-blueprint-proc-macro-core)	1m 44s
cargo test (gadget-context-derive)	1m 44s
cargo test (gadget-client-eigenlayer)	1m 42s
cargo test (gadget-client-evm)	1m 42s
cargo test (gadget-client-networking)	1m 43s
cargo test (gadget-client-tangle)	1m 43s
cargo test (gadget-crypto-sp-core)	1m 34s
cargo test (gadget-crypto-ed25519)	54s
cargo test (gadget-crypto-bls)	56s
cargo test (gadget-crypto-k256)	44s
cargo test (gadget-crypto-sr25519)	49s
cargo test (gadget-crypto-tangle-pair-signer)	1m 42s
cargo test (gadget-event-listeners-core)	56s
cargo test (gadget-event-listeners-evm)	1m 24s
cargo test (gadget-event-listeners-periodic)	48s
cargo test (gadget-event-listeners-tangle)	31s
cargo test (gadget-blueprint-serde)	1m 30s
cargo test (gadget-config)	59s
cargo test (gadget-executor)	38s
cargo test (gadget-keystore)	31s
cargo test (gadget-logging)	37s
cargo test (gadget-std)	24s
cargo test (gadget-utils-tangle)	36s
	30m 53s

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