Add dev shell environment #914

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	15m 12s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 44s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	9m 5s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	16m 7s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	19m 59s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 40s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 6s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	9m 39s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	15m 34s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	20m 42s
	2h 33m 48s

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