Add support for Soroban external calls 🎉 (#1679) #7102

Job	Run time
Linux x86-64	42m 57s
Repolinter	1m 11s
Docs	1m 18s
Linux Arm	20m 14s
Mac Arm	10m 44s
Container Image	11m 55s
Mac Intel	19m 34s
Stdlib	2m 5s
Windows	29m 48s
Mac Universal Binary	22s
Anchor Integration test	6m 6s
Solana Integration test	3m 15s
Polkadot Integration test with subxt	4m 34s
Polkadot Integration test	2m 31s
Soroban Integration test	11m 0s
Visual Code Extension	2m 28s
Coverage report	0s
	2h 50m 2s

Provide feedback