Use global system RNG

[davidanthoff]

On my system that gets rid of about 100ms of package load time.

Before:

348.6 ms  SentinelArrays 31.04% compilation time

After:

242.6 ms  SentinelArrays

My understanding is that the global RNG is thread-safe (and thread-local) since Julia 1.3, which is the min Julia version for this package, so I don't think there is actually any need for this package specific thread-local RNG creation, right? See https://github.com/JuliaLang/julia/blob/master/HISTORY.md#multi-threading-changes-5.

[codecov]

Codecov Report

Base: 95.38% // Head: 95.35% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (1e9e13d) compared to base (7270ee7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   95.38%   95.35%   -0.03%     
==========================================
  Files           4        4              
  Lines         996      990       -6     
==========================================
- Hits          950      944       -6     
  Misses         46       46              

Impacted Files	Coverage Δ
src/SentinelArrays.jl	91.72% <100.00%> (-0.19%)	⬇️

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