Allow custom stub template for java_binary

### Description of the feature request:

We would like to use our own java stub template to replace java_stub_template.txt. Our use case uses a lot of custom system properties that can be generated from rule dependencies. However Bazel's java stub template is fixed. It would be nice to allow custom java rule template through something like java_toolchain

从 java_stub_template.txt 和 java_toolchain 入口开始，了解 java_binary 当前如何选择其 stub 模板。定义如何传递和验证用户提供的模板，同时保留默认模板；完成的标准是 java_binary 能够针对从依赖项派生的系统属性使用自定义模板。

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