Add an editable Known As field to stroom user record

[at055612]

Currently when configured for OIDC we get the display name and full name from the IDP. Generally, the display name is something similar to an email address that is meaningful to users of stroom seeing it in a list of users. In some cases, the IDP supplies a display name that is just a UUID so stroom will display this, which is not helpful for the user.

We could potentially add an optional known as field that allows the admin to effectively provide an editable override of the IDP's display name which Stroom could show in lists of users or other screens.

Thought would be needed on what value is used in the audit columns if this field is editable. I suspect the audit column values would have to stay as they are if known as is a mutable thing.

[stroomdev66]

Wait for 7.6