Enable SDK to reattach large files to messages on retry

[mrashed-dev]

Description

This PR enables the SDK to re-attach large files when trying to retry the same request body. If a file_path is provided with the attachment request and the file stream is closed, the SDK will attempt to reopen it. The helper function attach_file_request_builder will now set the file_path in the object, so if you're currently using that helper function, the attachment will be ready for reattachment.

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 99.14%. Comparing base (8490435) to head (3d72f8b).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/nylas/utils/file_utils.rb	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #487      +/-   ##
==========================================
- Coverage   99.85%   99.14%   -0.72%     
==========================================
  Files          24       24              
  Lines         681      700      +19     
==========================================
+ Hits          680      694      +14     
- Misses          1        6       +5     

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[atejada]

LGTM 👍