Add `@Stable` to BigInteger and BigDecimal

[Jaikiran Pai]

Is this a duplicate of what's already being discussed here 
https://mail.openjdk.org/pipermail/core-libs-dev/2025-May/146692.html?

-Jaikiran

On 27/05/25 2:24 pm, wenshao wrote:
> Some final arrays of BigInteger and BigDecimal are stable and 
> immutable. We should add `@Stable` to give the optimizer more information
>
> -
> Shaojin Wen
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