Enable -set_exit_status by default

[mcandre]

Is your feature request related to a problem? Please describe.

When adding revive to large, complex workflows such as linter suites or CI/CD jobs, then there is a reasonable expectation that the tool provides meaningful exit codes by default.

Describe the solution you'd like

Enable -set_exit_status by default.

Describe alternatives you've considered

• Copying and pasting the -set_exit_status flag everywhere is cumbersome and unintuitive.
• Copying configuration files everywhere is also somewhat cumbersome and unintuitive.

Additional context

Somewhat of a breaking change, in case engineers are already running revive in their CI/CD pipelines. As a precaution, this change would be a good time to cut a new major version, 2.0.0. We can use SemVer to help communicate the new default behavior.