math/rand/v2: implement io.Reader for ChaCha8

[mauri870]

Fixes #67059

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Mauri de Souza Meneguzzo:

Patch Set 2:

(1 comment)

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Message from Mauri de Souza Meneguzzo:

Patch Set 2: Run-TryBot+1

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Patch Set 2:

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Message from Gopher Robot:

Patch Set 2:

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Message from Gopher Robot:

Patch Set 2: TryBot-Result-1

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Message from Mateusz Poliwczak:

Patch Set 2:

(3 comments)

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Message from Mauri de Souza Meneguzzo:

Patch Set 4:

(3 comments)

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Message from Mateusz Poliwczak:

Patch Set 4:

(1 comment)

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Message from Mauri de Souza Meneguzzo:

Patch Set 6:

(1 comment)

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Message from Mateusz Poliwczak:

Patch Set 6:

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Message from Mateusz Poliwczak:

Patch Set 6:

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Message from Filippo Valsorda:

Patch Set 6:

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