feat: add fb to transformer proxy

[ujjwal-ab]

Description of the change

add fb to transformer proxy

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers mentioned in a comment
• Changes have been reviewed by at least one other engineer
• Issue from task tracker has a link to this pull request

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (650030e) 87.05% compared to head (ea2b3c0) 87.06%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1900   +/-   ##
========================================
  Coverage    87.05%   87.06%           
========================================
  Files          459      460    +1     
  Lines        25098    25110   +12     
  Branches      6291     6291           
========================================
+ Hits         21850    21862   +12     
  Misses        2900     2900           
  Partials       348      348           

Impacted Files	Coverage Δ
...c/v0/destinations/facebook_pixel/networkHandler.js	97.43% <ø> (ø)
src/v0/destinations/fb/networkHandler.js	100.00% <100.00%> (ø)

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