Add Bazel Linter to the project

[anandwana001]

With the Bazel migration, we are now having BUILD and .bzl files in our codebase. We would like to add a linter that ensures all the Bazel files follow the same style.

We are looking forward to options like Skylint.
Skylint is not much recommended by officials, so we have another option to use Buildifier and it's Linter

Buildifier can be easily set up within the codebase. Link

Reference

• https://github.com/bazelbuild/continuous-integration/pull/448/files

- run: buildifier -mode=diff $(find . -iname BUILD.bazel -type f)

We have to fix this in parts

• Root files (BUILD.bazel WORKSPACE oppia_android_test.bzl)
• app module
• data module
• domain module
• model module
• testing module
• utility module

For this, we might have to do some additional stuff on WORKSPACE as well as BUILD file.

• Run the linter on our existing Bazel files. Create a PR that fixes all lint problems that the linter catches

• Add steps in the linter job of our GitHub Action workflow (similar to the Kotlin linting step) that will install and run the linter on our Bazel files

• Add documentation on how to install the linter in the prerequisites section of our wiki

[anandwana001]

Removing myself as assignee for this issue for this week for two points:

1. After package renaming most of the things get fixed already.
2. We need to have pre-commit hooks before adding new linters