Add a workspace_members datasource

[nbrys]

Please add a datasource that includes all users in the current workspace.

You can leverage the https://developer.atlassian.com/cloud/bitbucket/rest/api-group-workspaces/#api-workspaces-workspace-members-member-get api

[nbrys]

Hi @zahiar ,

Thanks for implementing this feature.
Question, wouldn't a map have been a better return type for this? It would make it easier to convert "names" into their slug.

I'm still trying to find an easy way of converting a list of usernames into their slug with this implementation