feat: contract read can read contract code #374

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 34s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	15m 48s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	10m 1s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	23m 59s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	21m 12s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 17s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	15m 59s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	10m 1s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	20m 43s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	20m 59s
	2h 47m 33s

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