Upgrade rules_java and add rule loads

[ted-xie]

• Upgrade to the latest rules_java 8.1.0
• Add loads for Java rules

NOTE: The loads and rules_java version unforutunately are tightly related. The paths for the bzl files for Java rules changed between rules_java 7 and 8.

[ted-xie]

For some more context on the rule loads: This PR is supposed to make rules_jvm_external work with Bazel 8, which removes all native Java rule loads.

Most users will be able to upgrade to Bazel 8 without manually adding all of these loads for Java rules. The exception is rule repository maintainers -- I'm not sure of the specifics, but it looks like rule reposotiries (rules_java, rules_android, etc) are special-cased, and autoloads from other rule repositories are disabled.

I was motivated to write this PR when trying to get rules_android to work with Bazel 8. Because I'm working inside a rule repo, it looks like transitive repo deps are not autoloaded -- for example, rules_jvm_external's use of java_library/java_import rules.

For more context on why rules_java 8.1.0: rules_java v8 changed where symbols such as java_binary and JavaInfo are loaded from. The old paths to various .bzl files seem to no longer exist, or at least are no longer visible.

[ted-xie]

/cc @comius

[jin]

Wait, did you forget to update MODULE.bazel?

[ted-xie]

Ah, my main repository already had rules_java bumped to 7.12.2 so I forgot I had to update it in RJE too. I see you already updated RJE's MODULE.bazel in 3ea9649. I think that should be sufficient.