feat(math): Add mutative api for NewIntFromBigInt

[hieuvubk]

Description

Closes: #XXXX

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[julienrbrt]

lgtm!

[tac0turtle]

Hey, we discussed this and decided to pull the mutative api into another struct to separate immutable from mutable. We will create and issue and work on this. for now ill close this pr, stay tuned for the issue

[julienrbrt]

Hi, we discussed internally, and we will wait for the API improvement mentioned here for math/v2.
If you still need this, please rebase and we will review again.