fix[lang]: exports for inline interfaces

[charles-cooper]

What I did

fix for #3959

How I did it

How to verify it

Commit message

Commit message for the final, squashed PR. (Optional, but reviewers will appreciate it! Please see our commit message style guide for what we would ideally like to see in a commit message.)

Description for the changelog

Cute Animal Picture

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 58.45%. Comparing base (e1adb7b) to head (e96b670).
Report is 6 commits behind head on master.

❗ Current head e96b670 differs from pull request most recent head bbe6735. Consider uploading reports for the commit bbe6735 to get more accurate results

Files	Patch %	Lines
vyper/semantics/analysis/utils.py	20.00%	2 Missing and 2 partials ⚠️
vyper/semantics/types/base.py	0.00%	1 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3960       +/-   ##
===========================================
- Coverage   90.86%   58.45%   -32.41%     
===========================================
  Files          95       95               
  Lines       14454    14458        +4     
  Branches     3205     3207        +2     
===========================================
- Hits        13134     8452     -4682     
- Misses        912     5375     +4463     
- Partials      408      631      +223     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.