Add initial implementation of rich output with emojis. #867

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	12m 2s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	12m 2s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	47s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	9m 20s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	11m 54s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	12m 5s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	12m 2s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	9m 43s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	12m 3s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	11m 54s
	1h 43m 52s

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