Add support for Soroban external calls 🎉 #7039

Job	Run time
Container Image	9m 56s
Linux x86-64	23m 50s
Linux Arm	8m 19s
Docs	1m 28s
Mac Intel	1s
Repolinter	44s
Stdlib	2m 13s
Mac Arm	3m 34s
Windows	9m 13s
Mac Universal Binary	0s
Polkadot Integration test with subxt	0s
Solana Integration test	0s
Anchor Integration test	0s
Polkadot Integration test	0s
Soroban Integration test	0s
Visual Code Extension	0s
Coverage report	0s
	59m 18s

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