Support returning member roles in OrganizationManager.Members()

[renxinhe]

Checklist

• I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

Auth0 API recently added support for member roles in the organizations/get-members endpoint. This enables us to fetch all the organization members' roles all at once without risking hitting the rate limit.

Currently, go-auth0 unfortunately doesn't return roles in OrganizationMember, and therefore there is no way to take advantage of this new RBAC feature.

// ===== github.com/auth0/go-auth0@v1.1.0/management/organization.go =====

// OrganizationMemberList is a list of OrganizationMembers.
type OrganizationMemberList struct {
	List
	Members []OrganizationMember `json:"members"`
}

// OrganizationMember holds member information for an Organization.
type OrganizationMember struct {
	UserID  *string `json:"user_id,omitempty"`
	Picture *string `json:"picture,omitempty"`
	Name    *string `json:"name,omitempty"`
	Email   *string `json:"email,omitempty"`
}

Describe the ideal solution

• Add a new Roles []OrganizationMemberRole field to OrganizationMember
• Optional: add a new boolean flag to Organization.Members() function to enable fetching of roles. Or simply ask users to use IncludeFields("roles")

Alternatives and current workarounds

No response

Additional context

No response