Upgrade to Datafusion 48

[friendlymatthew]

This commit accounts for breaking changes in Datafusion 48. See upgrading guide.

Here are the things that break:

• ScalarFunctionArgs now take in Fields rather than purely DataTypes. Since it is quite trivial to work around them as it purely contains metadata, I've forged it for now.

[adriangb]

Should we mark these as json?

[friendlymatthew]

Hmm, what do you mean by marking as json? Do you mean marking the return_field as a json type? This test case is expecting json_get_str to return a ScalarValue::Utf8.

[adriangb]

datafusion-functions-json/src/common_union.rs

Line 162 in b9dfacd

let json_metadata: HashMap<String, String> =

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 82.62%. Comparing base (b9dfacd) to head (3994247).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
src/rewrite.rs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   82.62%   82.62%           
=======================================
  Files          15       15           
  Lines        1180     1180           
  Branches     1180     1180           
=======================================
  Hits          975      975           
  Misses        144      144           
  Partials       61       61           

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