Add plugin support to Spotbugs

[mwindmark]

Adds support for using plugins with SpotBugs, see documentation for common plugins.

This can for example be used to activate the Find Security Bugs plugin.

spotbugs_config(
    name = "spotbugs-custom-config",
    effort = "default",
    fail_on_warning = True,
    plugin_list = [
        "@maven//:com_h3xstream_findsecbugs_findsecbugs_plugin",
    ],
    visibility = ["//visibility:public"],
)

[illicitonion]

This looks good, thanks for the contribution! Would you be able to add an example or test which uses this new functionality?

[mwindmark]

This looks good, thanks for the contribution! Would you be able to add an example or test which uses this new functionality?

Thanks! I saw that you recently added the example tests_and_lints so I extended that with Spotbugs. See the changes in 6c6a3cc

[illicitonion]

Perfect, thanks so much!