Split java_lite_grpc_library from java_grpc_library Bazel rule

As discussed in #5237. This is already the direction the rule was going.

Before making the change, I need to get some agreement internally that the benefit outweighs the churn to our users. Otherwise I wouldn't be able to migrate existing usages.

There will need to be a long period where the new rule exists and you can still specify "flavor" for the old behavior, to allow migration.

CC @ceason

まず #5237 の議論を読み、この issue で求められている内部合意を確認してください。既存の使用箇所を移行できるよう、旧ルールの flavor 動作を十分な期間維持したまま、独立した java_lite_grpc_library への移行範囲を定義してください。

索引モデルが issue の本文から書いたものです。