Add support for Soroban external calls 🎉 #7096

Job	Run time
Linux x86-64	36m 47s
Container Image	11m 47s
Linux Arm	19m 23s
Docs	1m 22s
Mac Arm	10m 47s
Mac Intel	17m 3s
Repolinter	1m 9s
Stdlib	2m 19s
Windows	29m 27s
Mac Universal Binary	20s
Soroban Integration test	1s
Anchor Integration test	1s
Polkadot Integration test	1s
Polkadot Integration test with subxt	1s
Solana Integration test	1s
Visual Code Extension	1s
Coverage report	1s
	2h 10m 31s

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