fix: dplyr::tbl() works again when a Parquet or CSV file is passed instead of a table name

[krlmlr]

Closes #38.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.93%. Comparing base (9b0f53f) to head (a529152).

❗ Current head a529152 differs from pull request most recent head a246038. Consider uploading reports for the commit a246038 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #91   +/-   ##
=======================================
  Coverage   85.93%   85.93%           
=======================================
  Files         106      106           
  Lines        3619     3619           
=======================================
  Hits         3110     3110           
  Misses        509      509           

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