OPL/Columnar Query Engine Support some TextExpression variants

[albertlockett]

Change Summary

OPL / Columnar Query Engine support the Concat, Join and Replace variants of the TextExpression. In all these cases, we parse from specially named functions:

logs | set attributes["x"] = concat("the", " attribute value ", "is: ", attributes["x"])
logs | set event_name = join(" ", "event happened:", event_name)
logs | set event_name = replace(event_name, "otel", "otap")

In each of these cases, we use the equivalent datafusion scalar function concat, concat_ws (for join) and replace.

Note: concat_ws is also used as an alias for join. I was thinking this'd be helpful for folks coming from a datafusion/SQL background. So it's equally possibly to write an expression like:

logs | set event_name = concat_ws(" ", "event happened:", event_name)

In planner.rs, I refactored the planning of function arguments into a reusable helper function.

What issue does this PR close?

• Related to OPL/Columnar query engine support TextScalarExpression #2578

How are these changes tested?

Unit

Are there any user-facing changes?

These new expression types are now supported via the transform processor.

Future work

Will add support for the TextExpression::Capture variant of this expression in future PR.

[codecov]

Codecov Report

❌ Patch coverage is 93.79433% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.47%. Comparing base (a20798a) to head (0edff6e).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2586      +/-   ##
==========================================
+ Coverage   88.35%   88.47%   +0.11%     
==========================================
  Files         613      618       +5     
  Lines      222680   226631    +3951     
==========================================
+ Hits       196752   200502    +3750     
- Misses      25404    25605     +201     
  Partials      524      524              

Components	Coverage Δ
otap-dataflow	90.36% <93.79%> (+0.10%)	⬆️
query_abstraction	80.61% <ø> (ø)
query_engine	90.74% <ø> (ø)
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	52.45% <ø> (ø)
quiver	92.27% <ø> (+0.35%)	⬆️

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