[Feature] Add randint for generating unsinged integers of every size

[dusnm]

This pull request introduces the randint package.
It's main purpose is to offer utility functions as a shortcut for generating cryptographically secure pseudo-random unsigned integers.

It includes the following functions

• randint.Uint8
• randint.Uint16
• randint.Uint32
• randint.Uint64

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.61290% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 31.11%. Comparing base (181f164) to head (48fb84c).

Files	Patch %	Lines
randint/randint.go	51.61%	10 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   30.76%   31.11%   +0.34%     
==========================================
  Files          25       26       +1     
  Lines        1833     1864      +31     
==========================================
+ Hits          564      580      +16     
- Misses       1226     1236      +10     
- Partials       43       48       +5     

Flag	Coverage Δ
unit-tests	31.11% <51.61%> (+0.34%)	⬆️

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