feat: add new local search optimizer

[sumny]

• mlr3 style
• tests

[codecov-commenter]

Codecov Report

Merging #186 (38d9ff4) into main (c307fb9) will decrease coverage by 3.30%.
The diff coverage is 22.80%.

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
- Coverage   95.89%   92.58%   -3.31%     
==========================================
  Files          38       42       +4     
  Lines        1144     1228      +84     
==========================================
+ Hits         1097     1137      +40     
- Misses         47       91      +44     

Impacted Files	Coverage Δ
R/OptimizerLocalSearch.R	22.80% <22.80%> (ø)
R/helper.R	97.91% <0.00%> (-0.05%)	⬇️
R/OptimInstanceMultiCrit.R	100.00% <0.00%> (ø)
R/OptimInstanceSingleCrit.R	100.00% <0.00%> (ø)
R/ContextOptimization.R	100.00% <0.00%> (ø)
R/mlr_callbacks.R	100.00% <0.00%> (ø)
R/CallbackOptimization.R	100.00% <0.00%> (ø)
R/OptimInstance.R	96.66% <0.00%> (+0.11%)	⬆️
R/Optimizer.R	83.01% <0.00%> (+1.38%)	⬆️

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