Added 90% credible interval

[Shoram444]

A new option for credibility intervals which includes the 90% CI.

BAT.smallest_credible_intervals now accepts nsigma_equivalent::Real as an argument with an additional option of $\approx 1.64$ representing 90% CI.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 47.26%. Comparing base (7c3a123) to head (f500b82).
Report is 5 commits behind head on main.

Files	Patch %	Lines
src/statistics/credible_intervals.jl	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #437      +/-   ##
==========================================
- Coverage   55.03%   47.26%   -7.78%     
==========================================
  Files         116      111       -5     
  Lines        5624     5385     -239     
==========================================
- Hits         3095     2545     -550     
- Misses       2529     2840     +311     

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[oschulz]

Thanks @Shoram444 !