Make it more universal, and customizable

[metal3d]

• no pointer receiver and return are now OK
• any type definition is OK
• interfaces are managed separatly
• fixes unwanted new lines
• ordering is customizable

[github-actions[bot]]

:arrow_up: Go test coverage increased from 87.7% to 91.5% compared to 42304a6f990da4109f16171945d60d442eceaf30 Updated Package Coverages: ```diff # Package Name | Prior | New + github.com/metal3d/goreorder/ordering | 87.7% | 91.5% ```

View coverage for all packages

```diff # Package Name | Coverage + github.com/metal3d/goreorder/ordering | 91.5% ```