Add support for Soroban external calls 🎉 #7062

Job	Run time
Linux Arm	19m 54s
Repolinter	22s
Docs	1m 13s
Container Image	11m 47s
Mac Arm	10m 42s
Linux x86-64	44m 13s
Stdlib	3s
Windows	29m 11s
Mac Intel	1s
Mac Universal Binary	0s
Anchor Integration test	5m 37s
Solana Integration test	3m 17s
Polkadot Integration test with subxt	5m 14s
Polkadot Integration test	7m 10s
Soroban Integration test	11m 4s
Visual Code Extension	2m 25s
Coverage report	0s
	2h 32m 13s

Provide feedback