RFR: 8376223: Add modeling interfaces for alegraic structures: rings, groups, and fields

[Joe Darcy]

First cut at adding modeling interfaces for the algebraic structures of rings, groups, and fields.

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Commit messages:
 - 8376223: Add modeling interfaces for alegraic structures: rings, groups, and fields

Changes: https://git.openjdk.org/valhalla/pull/1957/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1957&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376223
  Stats: 244 lines in 4 files changed: 244 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1957.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1957/head:pull/1957

PR: https://git.openjdk.org/valhalla/pull/1957