[feature request] rsa support about crypto HOT 4 OPEN

I worked on a bigint implementation this week. It covers a few but not all targets for now. But I think it can be a foundation for RSA.

https://github.com/kevinresol/bigint

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There was discussion about BigInteger and RSA here : #2
As you can see, the last suggestion was to be a separate library.
Also Nicolas mention here ( HaxeFoundation/haxe#7535 ) about adding large integer literals supports ( int64) , but not say anything about BigInt
So yes, for RSA support first need to be added BigInt.

P.S. Just as info here is a BigInt mplementation part of thx core https://github.com/fponticelli/thx.core/blob/master/src/thx/BigInt.hx

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@kevinresol it's a good start to keep it native.
I think it should be like the haxe.Int64.
Keep it native if it is possible and if it's not use it like the BigInt implementation of thx.core

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I realise now that thx seems to be mostly a port of BigInteger.js also. Well I wasted my time :D https://github.com/Aurel300/hx-bigint

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