added descriptor object to Account class #518

Job	Run time
Check	7m 6s
.NET	0s
Java	0s
Ruby	0s
Rust	0s
Python / Build / Build	2m 35s
Python / Mypy	43s
Python / Documentation	47s
Python / Lint	17s
Python / Browser Tests (edge, ubuntu) / Integration Tests (edge, ubuntu)	14m 10s
Python / Browser Tests (firefox, ubuntu) / Integration Tests (firefox, ubuntu)	37m 46s
Python / Browser Tests (chrome, ubuntu) / Integration Tests (chrome, ubuntu)	13m 5s
Python / Remote Tests (firefox) / Integration Tests (remote, firefox)	11m 31s
Python / Browser Tests (safari, macos) / Integration Tests (safari, macos)	1m 52s
	1h 29m 52s

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