Add support for extra checking

[remyleone]

What happened?

While generating my code I've stumbled upon the following error:

$ make generate
15:30:54 [ .. ] verify dependencies have expected content
all modules verified
15:30:57 [ OK ] go modules dependencies verified
15:30:57 [ .. ] go generate darwin_amd64
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x50 pc=0x224aff6]

goroutine 1 [running]:
github.com/crossplane/terrajet/pkg/types.init.0()
        /Users/sieben/workspace/crossplane-scaleway-provider/.work/pkg/pkg/mod/github.com/crossplane/terrajet@v0.4.2/pkg/types/reference.go:73 +0x116
exit status 2
apis/generate.go:32: running "go": exit status 1
generate: open /Users/sieben/workspace/crossplane-scaleway-provider/apis/account/v1alpha1/zz_generated.deepcopy.go: no such file or directory
15:31:03 [FAIL]
make[1]: *** [go.generate] Error 1
make: *** [generate] Error 2

How can we reproduce it?

Try to upgrade https://github.com/remyleone/crossplane-scaleway-provider/ to the latest version of terrajet

[loafoe]

@remyleone using Go 1.18? If so, see #271

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.