Add dev shell environment #901

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 28s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 12s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	9m 43s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	17m 8s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	21m 43s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	15m 0s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	17m 22s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	9m 39s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	23m 19s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	20m 8s
	2h 44m 42s

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