feat: re-export `gadget_clients` from the sdk #1008

Job	Run time
cargo clippy	7m 41s
Rustfmt	16s
cargo test (gadget-networking)	2m 22s
cargo test (incredible-squaring-blueprint)	6m 54s
cargo test (gadget-executor)	1m 17s
cargo test (incredible-squaring-blueprint-eigenlayer)	5m 17s
cargo test (gadget-utils-tangle)	4m 53s
cargo test (blueprint-examples)	12m 19s
cargo test (gadget-blueprint-proc-macro)	15m 26s
cargo test (gadget-blueprint-proc-macro-core)	4m 29s
cargo test (gadget-context-derive)	19m 7s
cargo test (gadget-client-eigenlayer)	4m 0s
cargo test (gadget-client-evm)	3m 17s
cargo test (gadget-client-tangle)	4m 43s
cargo test (gadget-crypto-sp-core)	1m 26s
cargo test (gadget-crypto-ed25519)	57s
cargo test (gadget-crypto-bls)	52s
cargo test (gadget-crypto-k256)	1m 4s
cargo test (gadget-crypto-sr25519)	58s
cargo test (gadget-event-listeners-core)	55s
cargo test (gadget-event-listeners-cronjob)	1m 2s
cargo test (gadget-blueprint-serde)	1m 41s
cargo test (gadget-config)	2m 50s
cargo test (gadget-keystore)	3m 43s
cargo test (gadget-std)	48s
	1h 48m 17s

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