refactor: migrate to weaker pseudo random number generator

[xaevik]

Since Cuid is akin to a Guid and should not be considered cryptographically secure, it makes no sense to have the structure rely on System.Security.Cryptography.RandomNumberGenerator for generating the value of Cuid._r.

Therefore SecureRandom() has been renamed to Random() and will call a static property in Cuid.Context that relies on System.Random instead which generates enough randomness to ensure uniqueness.

As a result, the performance of generating a Cuid improved to be much closer to Guid:

Before

Method	Categories	Mean	Error	StdDev	Ratio	RatioSD
Cuid_NewCuid	New()	123.90 ms	1.091 ms	1.020 ms	1.92	0.02
Guid_NewGuid	New()	64.57 ms	0.382 ms	0.357 ms	1.00	0.00
Cuid_ToString	New()+ToString()	349.98 ms	3.485 ms	3.089 ms	1.99	0.02
Guid_ToString	New()+ToString()	175.71 ms	1.298 ms	1.214 ms	1.00	0.00

After

Method	Categories	Mean	Error	StdDev	Ratio
Cuid_NewCuid	New()	44.88 ms	0.270 ms	0.253 ms	0.69
Guid_NewGuid	New()	64.82 ms	0.451 ms	0.422 ms	1.00
Cuid_ToString	New()+ToString()	264.79 ms	2.313 ms	2.050 ms	1.38
Guid_ToString	New()+ToString()	191.59 ms	1.147 ms	1.073 ms	1.00

Signed-off-by: Alan Brault alan.brault@visus.io

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