Refactor username to name

[oNaiPs]

Our user management does not have a concept of username (we use email for authentication), so "username" should be considered "name" instead.

Deprecation notice

• After upgrading, note that username will cease to exist. We will add this notice to the release notes and issue a major release.

[GMartinez-Sisti]

@oNaiPs Should we create an alias? I noticed that we already have that for some commands:

→ fyde-cli users remove -h
Delete users

Usage:
  fyde-cli users delete [user ID]... [flags]

Aliases:
  delete, remove, rm

[oNaiPs]

@GMartinez-Sisti unfortunately I couldn't find a straightforward way to do it with flags (the example you gave is a command). But will spend some more time on it

[oNaiPs]

@GMartinez-Sisti should be done now. It will continue supporting username.