Add functions to generate random values according to the distribution

[nikitamikhaylov]

Changelog category (leave one):

• New Feature

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Added functions (randUniform, randNormal, randLogNormal, randExponential, randChiSquared, randStudentT, randFisherF, randBernoulli, randBinomial, randNegativeBinomial, randPoisson ) to generate random values according to the specified distributions. This closes #21834.

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[nikitamikhaylov]

These functions could be slow because standard library is used and a distribution object is initialized per each block. But they are really useful for testing other statistical functions

[alexey-milovidov]

The names are slightly strange.
Should be similar to rand, rand64, or generateUUIDv4.

Maybe name them like

randNormal, randStudentT, etc.?

[nikitamikhaylov]

No problem, will do

[alexey-milovidov]

Can we add support for an additional "tag" argument for disambiguation, similarly to the existing rand, rand64?

[nikitamikhaylov]

Yes we also can. Initially thought about it, but since this functions will be used only for testing (from my perspective) then typical usecase won't involve multiple functions in the same query..

And it could be hard since these functions already accepts some arguments. We can add String argument as first in case if we want to differ functions.

[nikitamikhaylov]

Have problem reproducing failures found by fuzzer.