Add batch bytes to Marketo

[maryamsharif]

Marketo enforces a 10 MB file size limit for uploads via its Bulk Import API. We are adding the new batch_bytes limit to ensure that customers do not exceed this limit.

Testing

Include any additional information about the testing you have completed to
ensure your changes behave as expected. For a speedy review, please check
any of the tasks you completed below during your testing.

• Added unit tests for new functionality
• Tested end-to-end using the local server
• [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.11%. Comparing base (09ed757) to head (3e3d692).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2904   +/-   ##
=======================================
  Coverage   78.11%   78.11%           
=======================================
  Files        1050     1050           
  Lines       19438    19439    +1     
  Branches     3734     3735    +1     
=======================================
+ Hits        15184    15185    +1     
  Misses       2972     2972           
  Partials     1282     1282           

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