feat(macros): use `sdk::Error` instead of `Box<dyn Error>` #886

Job	Run time
cargo clippy	3m 38s
Rustfmt	13s
cargo test (gadget-networking)	2m 18s
cargo test (incredible-squaring-blueprint)	5m 45s
cargo test (gadget-executor)	1m 15s
cargo test (incredible-squaring-blueprint-eigenlayer)	4m 42s
cargo test (gadget-utils-tangle)	4m 19s
cargo test (gadget-blueprint-proc-macro)	7m 16s
cargo test (gadget-blueprint-proc-macro-core)	4m 34s
cargo test (gadget-context-derive)	14m 27s
cargo test (gadget-client-eigenlayer)	3m 23s
cargo test (gadget-client-evm)	2m 46s
cargo test (gadget-client-tangle)	4m 32s
cargo test (gadget-crypto-sp-core)	1m 34s
cargo test (gadget-crypto-ed25519)	41s
cargo test (gadget-crypto-bls)	44s
cargo test (gadget-crypto-k256)	1m 9s
cargo test (gadget-crypto-sr25519)	52s
cargo test (gadget-event-listeners-core)	56s
cargo test (gadget-event-listeners-cronjob)	1m 0s
cargo test (gadget-blueprint-serde)	50s
cargo test (gadget-config)	2m 5s
cargo test (gadget-keystore)	3m 42s
cargo test (gadget-std)	47s
	1h 13m 28s

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