Add exception for kubernetes_cluster_role's non_resource_urls rule field

[pdecat]

This PR adds an exception for the conversion of kubernetes' nonResourceURLs ClusterRole & Role rule field into the terraform provider's non_resource_urls casing.

Without this change, the field is converted as non_resource_ur_ls.

I believe the underlying issue is that converting plain strings poses an issue with plural acronyms for which case is not explicitly defined:

Go field names must be CamelCase. JSON field names must be camelCase. Other than capitalization of the initial letter, the two should almost always match. No underscores nor dashes in either.
[...]
Acronyms should similarly only be used when extremely commonly known. All letters in the acronym should have the same case, using the appropriate case for the situation. For example, at the beginning of a field name, the acronym should be all lowercase, such as "httpGet". Where used as a constant, all letters should be uppercase, such as "TCP" or "UDP".

cf. https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#naming-conventions

I believe the conversion process should take the source casing into account (e.g. from Camel Case to Snake Case), or better yet have some pivot format defining at the very least what's a word, an acronym, and if it's plural or singular. I did not find any Go implementation doing that yet.

[sl1pm4t]

Thanks @pdecat. The iancoleman/strcase library does having some logic to handle acronyms, but I guess not pluralised acronyms.

[pdecat]

Thanks!

The iancoleman/strcase library does having some logic to handle acronyms, but I guess not pluralised acronyms.

I initially planned to submit a PR to that library then found out it would probably be way too intrusive to get accepted. I glanced at https://github.com/stoewer/go-strcase too, and it looked the same.

[pdecat]

Sorry, this PR lacked real world testing and the role.rule. path used is incorrect.
Fix PR: #6 .