RFR: 8332086: Remove the usage of ServiceLoader in j.u.r.RandomGeneratorFactory [v4]

[Raffaello Giulietti]

> All random number generator algorithms are implemented in module `java.base`. The usage of `ServiceLoader` in `j.u.r.RandomGeneratorFactory` is no longer needed.

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

  Replace SimpleImmutableEntry constructor with Map.entry() factory method.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19212/files
  - new: https://git.openjdk.org/jdk/pull/19212/files/e8432cc6..4bc5bf95

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19212&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19212&range=02-03

  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19212.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19212/head:pull/19212

PR: https://git.openjdk.org/jdk/pull/19212