RFR: 8366478: BigDecimal roots [v8]

[fabioromano1]

> An implementation of `BigDecimal.nthRoot(int, MathContext)`.

fabioromano1 has updated the pull request incrementally with one additional commit since the last revision:

  Update preferred scale and method name

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/27148/files
  - new: https://git.openjdk.org/jdk/pull/27148/files/f7ca3421..4ff28c39

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27148&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27148&range=06-07

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27148.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27148/head:pull/27148

PR: https://git.openjdk.org/jdk/pull/27148