fix: ensure that invalid URLs are bubbled up as errors when parsed

[rtyler]

This comes from an error report in Slack. Since url::ParseError gives us
a few different types, we can use those to determine if something is
"file pathy" compared to just an outright incorrect URL

[codecov]

Codecov Report

❌ Patch coverage is 76.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.72%. Comparing base (1d6ba3d) to head (e3fa17e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/table/builder.rs	76.66%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3766   +/-   ##
=======================================
  Coverage   75.71%   75.72%           
=======================================
  Files         145      145           
  Lines       44709    44724   +15     
  Branches    44709    44724   +15     
=======================================
+ Hits        33853    33868   +15     
+ Misses       9185     9184    -1     
- Partials     1671     1672    +1     

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