Add bazel plugin

[lengau]

What needs to get done

Bazel - a popular build system projects is not currently listed among available plugins.
For now you can work around it by using nil or dump plugin and call the build tool in override-build, but it is not super obvious for newbies.

Why it needs to get done

It is used to build tensorflow-lite and others

Originally requested by @Asalle: canonical/snapcraft#5197

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-4136.

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