Added eventId and eventDate to usageItem

The field eventDate was added to metered-usage service API contract.
The field eventId was added to metered-usage service API contract

Removed AttributeItem class for MeteredUsage

Changed Attributes to a Map and removed AttributeItem class as it is no longer needed due to latest definitions from MeteredUsage team.

Changed custom Attribute in order info

Fixed field names to match the structure sent from the MP.

Added custom attributes to Order Info

1.66

 Tag for 1.66

Changed UsageItem attributes types

Changed Data Types used for new Client on SDK to consume Metered Usage V2 API.

Create API client for metered usage v2

Creation of new Client on SDK to consume Metered Usage V2 API

Locale converter

Fixed bug in Locale jdk where Locale is created with invalid tag.

Vendor Validation service

Added InitBinder for VendorFieldValidationController and added UT for it

Added Accept-language header for Vendor Validation and Vendor Required Required Field Service

Replace Locale parameter with Accept-Language Header

Added new SourceBackedCredentials

SourceBackedCredentials added, we need to implement this in every microservices, to provide credentials by a key.