add String, (Un)MarshalText for acl types.

[izolight]

Sometimes it's useful converting the constants of the acl types from/to text.
The text representation is the name without the prefix.
When converting from text to the types the string will be normalized to catch most variants.

[d1egoaz]

@izolight it seems you'll need to update the map declaration mapping := map[AclOperation]string{

[dnwe]

@izolight hiya — just wondering if you think you'll have time to resume work on this PR?

[izolight]

I updated it so that the pointers are now dereferenced in the function.

[ghost]

Thank you for your contribution! However, this pull request has not had any activity in the past 90 days and will be closed in 30 days if no updates occur.
If you believe the changes are still valid then please verify your branch has no conflicts with master and rebase if needed. If you are awaiting a (re-)review then please let us know.

[izolight]

I've rebased to the latest master an implemented the proposed changes.
Anything preventing this PR from getting merged now?

[bai]

Thanks for contributing 🙏🏼