feat: Add organizations endpoint for users (#50)

* feat: Add organizations endpoint for users

This moves the /user endpoint to /users/me instead. This
will reduce code duplication.

This adds /users/<name>/organizations to list organizations
a user has access to. It doesn't contain the permissions a
user has over the organizations, but that will come in a future
contribution.

* Fix requested changes

* Fix tests

* Fix timeout

* Add test for UserOrgs

* Add test for userparam getting

* Add test for NoUser

coderd/organizations.go

@@ -0,0 +1,25 @@
+package coderd
+
+import (
+	"time"
+
+	"github.com/coder/coder/database"
+)
+
+// Organization is the JSON representation of a Coder organization.
+type Organization struct {
+	ID        string    `json:"id" validate:"required"`
+	Name      string    `json:"name" validate:"required"`
+	CreatedAt time.Time `json:"created_at" validate:"required"`
+	UpdatedAt time.Time `json:"updated_at" validate:"required"`
+}
+
+// convertOrganization consumes the database representation and outputs an API friendly representation.
+func convertOrganization(organization database.Organization) Organization {
+	return Organization{
+		ID:        organization.ID,
+		Name:      organization.Name,
+		CreatedAt: organization.CreatedAt,
+		UpdatedAt: organization.UpdatedAt,
+	}
+}