Support pricing multiple envs (multiple moesif apps)

[HiranyaKavishani]

Purpose

$subject
Change the format of storing pricing related info.

1. Format of PRICING_METADATA column in DP_SUBSCRIPTION_POLICY table
2. BILLING_METERID column in DP_API_SUBSCRIPTION_POLICY (Changed to BILLING_INFO )

PRICING_METADATA

{
  "external": {
    "priceId": "price_1SmRl07qz6r4ijoAAUDlmQMr",
    "productId": "prod_TjvbzR06zklSCJ"
  }
  “tiers” : {
    “tierIndex” : 1,
    “startUnit” : 0,
    “endUnit” : 0,
    “unitPrice” : 10,
    “flatPrice” : 15,
   }
}

Current format:

  [
  {
    "billingAppId": "92:568",
    "external": {
      "priceId": "price_1SmRl07qz6r4ijoAAUDlmQMr",
      "productId": "prod_TjvbzR06zklSCJ",
     },
    "tiers" : {
    	“tierIndex” : 1,
    	“startUnit” : 0,
    	“endUnit” : 100,
    	“unitPrice” : 10,
    	“flatPrice” : 15,
   }
   },
   {
    "billingAppId": "93:569",
    "external": {
      "priceId": "price_1RFRl07qz24r4ijoUDlmQMr",
      "productId": "prod_TYR0th5J"
    },
     "tiers" : {
    	“tierIndex” : 1,
    	“startUnit” : 0,
    	“endUnit” : 100,
    	“unitPrice” : 12,
    	“flatPrice” : 10,
   }
  }
]

BILLING_INFO

{
"billingAppId" : "92:568",
"billingMeterId" : "2fht2nfednvc"
}

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