Make some utils public to ease transition

[yurishkuro]

This makes it easier to reconcile our internal code with oss as part of the move (#365).

[codecov]

Codecov Report

Merging #1730 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1730   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files         193      193           
  Lines        9364     9364           
=======================================
  Hits         9211     9211           
  Misses        119      119           
  Partials       34       34

Impacted Files	Coverage Δ
...mpling/strategystore/adaptive/weightvectorcache.go	100% <100%> (ø)	⬆️
...lugin/sampling/strategystore/adaptive/processor.go	100% <100%> (ø)	⬆️
plugin/sampling/strategystore/adaptive/cache.go	100% <100%> (ø)	⬆️
...ugin/sampling/strategystore/adaptive/floatutils.go	100% <100%> (ø)

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