fix(instr-knex): set correct SpanKind for traces

[david-luna]

Which problem is this PR solving?

• The span kind is set to default where it should be set to SpanKind.CLIENT

Fixes: #1839

Short description of the changes

• set span kind to SpanKind.CLIENT when starting it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.45%. Comparing base (dfb2dff) to head (f540e75).
Report is 84 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2157      +/-   ##
==========================================
- Coverage   90.97%   90.45%   -0.53%     
==========================================
  Files         146      147       +1     
  Lines        7492     7576      +84     
  Branches     1502     1574      +72     
==========================================
+ Hits         6816     6853      +37     
- Misses        676      723      +47     

Files	Coverage Δ
...emetry-instrumentation-knex/src/instrumentation.ts	98.71% <ø> (-0.07%)	⬇️

... and 26 files with indirect coverage changes