feat(macros): use `sdk::Error` instead of `Box<dyn Error>` #887

Job	Run time
Rustfmt	15s
cargo clippy	5m 13s
cargo test (gadget-networking)	3m 42s
cargo test (incredible-squaring-blueprint)	6m 22s
cargo test (gadget-executor)	1m 38s
cargo test (incredible-squaring-blueprint-eigenlayer)	5m 36s
cargo test (gadget-utils-tangle)	4m 57s
cargo test (gadget-blueprint-proc-macro)	17m 12s
cargo test (gadget-blueprint-proc-macro-core)	4m 43s
cargo test (gadget-context-derive)	20m 18s
cargo test (gadget-client-eigenlayer)	3m 27s
cargo test (gadget-client-evm)	3m 7s
cargo test (gadget-client-tangle)	4m 50s
cargo test (gadget-crypto-sp-core)	1m 28s
cargo test (gadget-crypto-ed25519)	1m 11s
cargo test (gadget-crypto-bls)	1m 0s
cargo test (gadget-crypto-k256)	1m 21s
cargo test (gadget-crypto-sr25519)	57s
cargo test (gadget-event-listeners-core)	1m 14s
cargo test (gadget-event-listeners-cronjob)	1m 9s
cargo test (gadget-blueprint-serde)	1m 7s
cargo test (gadget-config)	2m 16s
cargo test (gadget-keystore)	3m 46s
cargo test (gadget-std)	51s
	1h 37m 40s

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