Add `contract alias ls`. #1031

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 47s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 18s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	11m 26s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	17m 20s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	20m 29s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 45s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 28s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	10m 29s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	29m 11s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	20m 26s
	2h 51m 39s

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