improve type stability of SAMIN

[mcreel]

adds a few type annotations

[codecov[bot]]

Codecov Report

Merging #1029 (6c0a15c) into master (1f1258c) will decrease coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1029      +/-   ##
==========================================
- Coverage   85.40%   85.28%   -0.12%     
==========================================
  Files          43       43              
  Lines        3199     3201       +2     
==========================================
- Hits         2732     2730       -2     
- Misses        467      471       +4     

Impacted Files	Coverage Δ
src/multivariate/solvers/constrained/samin.jl	75.58% <100.00%> (-1.48%)	:arrow_down:
...ultivariate/solvers/zeroth_order/particle_swarm.jl	98.84% <0.00%> (-0.39%)	:arrow_down:

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