RFR: 8357913: Add `@Stable` to BigInteger and BigDecimal

[ExE Boss]

On Sun, 25 May 2025 22:35:56 GMT, Shaojin Wen <swen at openjdk.org> wrote:

> Some static final arrays of BigInteger and BigDecimal are stable and immutable. We should add `@Stable` to give the optimizer more information

Note that `BigInteger.mag` should probably also be made `@Stable` once `BigInteger​.largePrime(…)` is changed to not write to `p.mag[…]`.

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PR Comment: https://git.openjdk.org/jdk/pull/25437#issuecomment-2909052698