feat(types,utils): DML can create a bigNumber property (#7801)

what:

- adds bigNumber as a property to DML
- creates a bigNumber options field (`raw_{{ field }}`) as a part of the schema

RESOLVES CORE-2375

packages/core/utils/src/dal/mikro-orm/big-number-field.ts

@@ -1,7 +1,7 @@
-import { Property } from "@mikro-orm/core"
-import { isPresent, trimZeros } from "../../common"
-import { BigNumber } from "../../totals/big-number"
 import { BigNumberInput } from "@medusajs/types"
+import { Property } from "@mikro-orm/core"
+import { isDefined, isPresent, trimZeros } from "../../common"
+import { BigNumber } from "../../totals/big-number"
 
 export function MikroOrmBigNumberProperty(
   options: Parameters<typeof Property>[0] & {
@@ -45,12 +45,22 @@ export function MikroOrmBigNumberProperty(
           const raw = bigNumber.raw!
           raw.value = trimZeros(raw.value as string)
 
-          this.__helper.__data[columnName] = bigNumber.numeric
-          this.__helper.__data[rawColumnName] = raw
+          // Note: this.__helper isn't present when directly working with the entity
+          // Adding this in optionally for it not to break.
+          if (isDefined(this.__helper)) {
+            this.__helper.__data[columnName] = bigNumber.numeric
+            this.__helper.__data[rawColumnName] = raw
+          }
 
           this[rawColumnName] = raw
         }
 
+        // Note: this.__helper isn't present when directly working with the entity
+        // Adding this in optionally for it not to break.
+        if (!isDefined(this.__helper)) {
+          return
+        }
+
         // This is custom code to keep track of which fields are bignumber, as well as their data
         if (!this.__helper.__bignumberdata) {
           this.__helper.__bignumberdata = {}