[SQSERVICES-1772] OAuth authorization endpoint (2/n)#2901

battermann wants to merge 8 commits intoSQSERVICES-1770-be-oatuh-internal-endpoint-to-register-o-auth-appwireapp/wire-server:SQSERVICES-1770-be-oatuh-internal-endpoint-to-register-o-auth-appfrom

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