feat: [CometFuzz] Add support for literal arguments [WIP]

[andygrove]

Which issue does this PR close?

Part of #2628

Rationale for this change

Increase test coverage by picking both columns and literals for arguments to scalar functions.

SELECT "뇾涓鼁覔", c26, instr("뇾涓鼁覔", c26) AS x FROM test1 ORDER BY "뇾涓鼁覔", c26;

What changes are included in this PR?

How are these changes tested?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.17%. Comparing base (f09f8af) to head (211bb11).
⚠️ Report is 638 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2645      +/-   ##
============================================
+ Coverage     56.12%   59.17%   +3.04%     
- Complexity      976     1447     +471     
============================================
  Files           119      147      +28     
  Lines         11743    13743    +2000     
  Branches       2251     2360     +109     
============================================
+ Hits           6591     8132    +1541     
- Misses         4012     4388     +376     
- Partials       1140     1223      +83     

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[comphead]

For literals btw we still need to support maps and structs #1937
should we resume work on it?