Add methods to expand coverage of `users` endpoints#57

Draft

evanofslack wants to merge 6 commits intoRocketChat:masterfrom evanofslack:users

+264-3

Commits on Jul 15, 2022

add Me method and struct type
evan slack
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add test for Me method
evan slack
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Commits on Jul 17, 2022

add GetUsers method
evan slack
committed

Commits on Jul 19, 2022

add GetPreferences and SetPreferences methods
evan slack
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add ListTeams method
evan slack
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tidy users code, make type private, add check to test, remove comments
evan slack
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