Refactor logging and error handling in Contentstack client

[reeshika-h]

update region aliases and endpoints in JSON configuration

[github-actions]

Coverage report for commit: 4b9eb2a
File: coverage/clover.xml

Cover ┌─────────────────────────┐ Freq.
   0% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  10% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  20% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  30% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  40% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  50% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  60% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  70% │ ███░░░░░░░░░░░░░░░░░░░░ │  5.3%
  80% │ ███████████████████████ │ 47.4%
  90% │ ████████░░░░░░░░░░░░░░░ │ 15.8%
 100% │ ████████████████░░░░░░░ │ 31.6%
      └─────────────────────────┘
 *Legend:* █ = Current Distribution 

Summary - Lines: 86.16% | Methods: 96.15% | Branches: 67.61%

Files	Lines	Methods	Branches
lib
contentstack.js	100.00%	100.00%	100.00%
contentstackClient.js	100.00%	100.00%	85.29%
contentstackCollection.js	86.67%	100.00%	90.00%
entity.js	75.61%	100.00%	53.45%
lib/core
Util.js	96.77%	100.00%	85.29%
concurrency-queue.js	90.40%	90.91%	83.74%
contentstackError.js	100.00%	100.00%	100.00%
contentstackHTTPClient.js	100.00%	100.00%	94.59%
messageHandler.js	66.67%	57.14%	60.00%
region.js	100.00%	100.00%	75.00%
lib/marketplace/app/hosting
deployment.js	81.16%	100.00%	63.16%
index.js	80.30%	100.00%	58.23%
lib/marketplace/app
index.js	80.68%	90.00%	53.26%
lib/marketplace/app/oauth
index.js	83.78%	100.00%	52.63%
lib/marketplace/apprequest
index.js	83.33%	100.00%	58.54%
lib/marketplace/authorization
index.js	83.78%	100.00%	65.12%
lib/marketplace
index.js	90.70%	100.00%	82.76%
lib/marketplace/installation
index.js	82.00%	100.00%	56.52%
lib/marketplace/installation/webhooks
index.js	82.05%	100.00%	53.19%

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