CCM-12935 Add LetterQueue table

Author: stevebux

infrastructure/terraform/components/api/ddb_table_letter_queue.tf

@@ -0,0 +1,44 @@
+resource "aws_dynamodb_table" "letters" {
+  name         = "${local.csi}-letter-queue"
+  billing_mode = "PAY_PER_REQUEST"
+
+  hash_key  = "supplierId"
+  range_key = "letterId"
+
+  ttl {
+    attribute_name = "ttl"
+    enabled        = true
+  }
+
+  local_secondary_index {
+    name            = "timestamp-index"
+    range_key       = "queueTimestamp"
+    projection_type = "ALL"
+  }
+
+  attribute {
+    name = "supplierId"
+    type = "S"
+  }
+
+  attribute {
+    name = "letterId"
+    type = "S"
+  }
+
+  attribute {
+    name = "queueTimestamp"
+    type = "S"
+  }
+
+  point_in_time_recovery {
+    enabled = true
+  }
+
+  tags = merge(
+    local.default_tags,
+    {
+      NHSE-Enable-Dynamo-Backup-Acct = "True"
+    }
+  )
+}