feat: add 'config' field to proxy request for v1

[Gauravudia]

Description

Resolves INT-1233
Update the transformer <> server proxy contract to support including 'config' at the root level in the proxy request from the server to the transformer. With these changes, the server will now append an additional 'config' field to the proxy request, propagating it to the transformer for utilization.

Linear Ticket

https://linear.app/rudderstack/issue/INT-1233/transformerproxy-propagate-destination-config-to-transformerproxy-api

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

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[koladilip]

DestinationConfig would be better avoid confusion

[Gauravudia]

Incorporated the changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d078c93) 73.99% compared to head (186a5a8) 74.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4264      +/-   ##
==========================================
+ Coverage   73.99%   74.13%   +0.14%     
==========================================
  Files         388      388              
  Lines       55097    55098       +1     
==========================================
+ Hits        40769    40849      +80     
+ Misses      12004    11939      -65     
+ Partials     2324     2310      -14     

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