Added account server useful for storage of provisioned accounts (#188) #1695

Job	Run time
ERC20 processor build only	4m 45s
Build and cache all tests (release-fast)	3m 39s
Build and cache all tests (release-lto)	6m 3s
Fmt and clippy	3m 18s
Payment lib unit test run	2m 53s
Build and cache all tests (dev)	4m 43s
Payment tests (basic + multi)	4m 15s
Payment tests (custom)	6m 12s
Payment tests (multi)	3m 59s
Payment tests (errors)	4m 45s
Payment tests (rpc pool)	3m 29s
Test Holesky faucet	5m 18s
	53m 19s

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