optim bazel

[wu-hanqing]

• add .bazelversion to support bazelisk
• add .bazelignore and exclude cmake_third_party to fix this

[github-actions]

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[lioncfliu]

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[weimch]

All BUILD files in this project are bazel BUILD files. The meaning is clear. And we won't define another BUILD file that is not a bazle BUILD file.

Is there exists any special advantage to change filename from BUILD into BUILD.bazel ?

[wu-hanqing]

Sorry for the late reply. Of course, bazel supports both forms, but on some MacOS platforms, the file system is not case-sensitive, which can result in not being able to create a build folder in the working directory.

If this is not a problem, I will drop this modification.

[weimch]

Sorry for not checking the email notification in time when your replied.

tRPC-Cpp has no plan to support other platforms expect linux. This modification seems no need.

[wu-hanqing]

Sorry for not checking the email notification in time when your replied.

tRPC-Cpp has no plan to support other platforms expect linux. This modification seems no need.

Fixed

[wu-hanqing]

I have read the CLA Document and I hereby sign the CLA