fix(table): prevent TableColumn function props trigger recursive reactivity

[mlmoravek]

Fixes #838

Proposed Changes

• call toRow for props to prevent produce "Maximum recursive updates exceeded" when functions are given

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 8.61%. Comparing base (484cfe8) to head (c2cc3af).
Report is 18 commits behind head on develop.

Files	Patch %	Lines
packages/oruga/src/components/table/Table.vue	0.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #848       +/-   ##
===========================================
- Coverage    56.71%   8.61%   -48.11%     
===========================================
  Files           30     109       +79     
  Lines         1511    5294     +3783     
  Branches       544    1953     +1409     
===========================================
- Hits           857     456      -401     
- Misses         654    3846     +3192     
- Partials         0     992      +992     

Flag	Coverage Δ
oruga-next	8.61% <0.00%> (-48.11%)	⬇️

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