move java rule impls to impl and add wrappers

[priceofcode]

Note

Medium Risk
Touches core Bazel Java rule wiring and relocates large portions of implementation code, which can affect rule loading/visibility and build behavior despite being largely a refactor.

Overview
Refactors the Java Starlark rules to separate public rule definitions from their implementations: core logic for java_binary, java_library, java_import, and related helpers is moved into new java/common/rules/impl/*.bzl modules, while new Bazel-facing wrappers are added under java/bazel/rules to proxy into these impls.

bazel_java_binary.bzl is slimmed down and now exports shared pieces (bazel_base_binary_impl, make_binary_rule, BASE_BINARY_ATTRS) while java_test is moved into a dedicated bazel_java_test.bzl; bazel_java_binary_wrapper.bzl visibility is widened to //java. Build packaging is updated via new filegroup wiring (java/common/rules/BUILD, java/common/rules/impl/BUILD, and java/common/BUILD), the placeholder empty.bzl is removed, and Android lint option tokenization is switched to use semantics.tokenize_javacopts directly.

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