feat: contract read can read contract code #351

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	13m 47s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	15m 23s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	8m 51s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	19m 10s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	19m 23s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	13m 55s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	15m 2s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	11m 24s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	16m 34s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	19m 47s
	2h 33m 16s

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