switched to RWMutex to avoid fully locking if only reads occur

[BigJk]

Pull Request for issue

#17

Description

Switch from Mutex to RWMutex. Parallel read operations shouldn't lock up the whole structure, thus a RWMutex makes more sense in this scenario to speedup reading.

Testing Instructions

Additional Comments

[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff          @@
##           master   #19   +/-   ##
====================================
  Coverage      80%   80%           
====================================
  Files           8     8           
  Lines         500   500           
====================================
  Hits          400   400           
  Misses        100   100

Impacted Files	Coverage Δ
pkg/types/list/list.go	99.04% <100%> (ø)	⬆️
pkg/types/hashmap/hmap.go	100% <100%> (ø)	⬆️
pkg/types/set/set.go	100% <100%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff          @@
##           master   #19   +/-   ##
====================================
  Coverage      80%   80%           
====================================
  Files           8     8           
  Lines         500   500           
====================================
  Hits          400   400           
  Misses        100   100

Impacted Files	Coverage Δ
pkg/types/list/list.go	99.04% <100%> (ø)	⬆️
pkg/types/hashmap/hmap.go	100% <100%> (ø)	⬆️
pkg/types/set/set.go	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update aa3ba4b...25787d7. Read the comment docs.

[kasvith]

great work