RFR: 8077587: BigInteger Roots [v6]

[fabioromano1]

> This PR implements nth root computation for BigIntegers using Newton method.

fabioromano1 has updated the pull request incrementally with two additional commits since the last revision:

 - Merge branch 'nth-root-branch' of https://github.com/fabioromano1/jdk into nth-root-branch
 - Restore nthRoot() public methods in BigInteger.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24898/files
  - new: https://git.openjdk.org/jdk/pull/24898/files/4729a468..823d2f63

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24898&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24898&range=04-05

  Stats: 74 lines in 1 file changed: 74 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24898.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24898/head:pull/24898

PR: https://git.openjdk.org/jdk/pull/24898