missing option exclude_cn_from_sans when requesting a signed certificate

[darkedges]

I have discovered that when I use a CSR with a SubjecDN greater than 63 characters in length it throws the following

idna: invalid label "UID=f0486469-6aa7-4a93-8cc2-3e64f30e1789,CN=Nicholas Peter Irving"

I have raised an issue
hashicorp/vault#11721
to get this looked at, how I have noticed that i can disabled this check through the UI by using the Sign Verbatim option.

This adds an additional parameter in the request to /sign

    exclude_cn_from_sans: false

Is this something that looks like we can add?