refactor(networking): stop using `Box<dyn Error>` #1010

Job	Run time
cargo clippy	8m 17s
cargo test (gadget-networking)	2m 50s
Rustfmt	15s
cargo test (gadget-executor)	1m 53s
cargo test (incredible-squaring-blueprint)	4m 45s
cargo test (incredible-squaring-blueprint-eigenlayer)	5m 19s
cargo test (gadget-utils-tangle)	5m 30s
cargo test (blueprint-examples)	7m 52s
cargo test (gadget-blueprint-proc-macro)	7m 37s
cargo test (gadget-blueprint-proc-macro-core)	4m 38s
cargo test (gadget-context-derive)	7m 37s
cargo test (gadget-client-eigenlayer)	4m 4s
cargo test (gadget-client-evm)	3m 24s
cargo test (gadget-client-tangle)	5m 10s
cargo test (gadget-crypto-sp-core)	1m 33s
cargo test (gadget-crypto-ed25519)	1m 36s
cargo test (gadget-crypto-bls)	1m 3s
cargo test (gadget-crypto-k256)	1m 14s
cargo test (gadget-crypto-sr25519)	55s
cargo test (gadget-event-listeners-core)	1m 10s
cargo test (gadget-event-listeners-cronjob)	1m 15s
cargo test (gadget-blueprint-serde)	1m 42s
cargo test (gadget-config)	3m 11s
cargo test (gadget-keystore)	3m 48s
cargo test (gadget-std)	53s
	1h 27m 31s

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