Enhancement/solution rearchitecture

[ajsuth]

• Middleware has been rearchitected.
• Related Products feature added.
• Mock commands/services put in place so development doesn't rely on active 3rd party accounts.

Solution has been smoke tested to be able to create products in the seller app and purchase them in buyer app.

The data architecture has been left untouched, so we should still be able to utilise the existing marketplace data without issue.

The app settings have been modified, so changes may be required in the deployment variables.

[crhistianramirez]

The following updates to app settings have been introduced in this pull request

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Changed

• EasyPostSettings:APIKey becomes EasyPostSettings:ApiKey

Added

Setting Name	Description
EnvironmentSettings:AddressValidationProvider	Which address validation service provider will be used where address validation has been requested. Options include: "Smarty". Otherwise no validation will be performed.
EnvironmentSettings:CMSProvider	Which content management system provider will be used for storing images and pdfs for product information. Options include: N/A. Otherwise will default to custom integration with Azure blob storage
EnvironmentSettings:CurrencyConversionProvider	Which currency conversion provider should be used for currency conversion. Options include: "ExchangeRates". Otherwise not handled.
EnvironmentSettings:EmailServiceProvider	Which email service provider should be used for emails. Options include: "SendGrid". Otherwise no emails will be sent.
EnvironmentSettings:OMSProvider	Which order management service provider should be used for exporting orders to. Options include: "Zoho". Otherwise orders will not be forwarded to OMS.
EnvironmentSettings:PaymentProvider	Which payment service provider should be used for payments. Options include: "CardConnect". Otherwise all payments and transactions will be mocked.
ZohoSettings:ApiUrl	Zoho's API URL. Default value if not set "https://books.zoho.com/api/v3"

Removed

• SmartyStreetSettings:SmartyEnabled - Instead provide empty string to EnvironmentSettings:AddressValidationProvider
• SendgridSettings:Enabled - Instead provide empty string to EnvironmentSettings:EmailServiceProvider