Support IAM tag factory context expansion in organization / project modules and FAST resman stage (#3226)

* tag factory context

* support tag factory contexts in resman

* schemas

* fix schema

modules/project/variables.tf

@@ -92,6 +92,7 @@ variable "factories_config" {
     quotas        = optional(string)
     tags          = optional(string)
     context = optional(object({
+      iam_principals        = optional(map(string), {})
       notification_channels = optional(map(string), {})
       org_policies          = optional(map(map(string)), {})
       tag_keys              = optional(map(string), {})