Add Canva website-v2 template

[tomnugent]

This PR

This PR adds a canva.com.website-v2.json template, which builds on canva.com.website.json but introduces breaking changes. A new template is being introduced based on advice in the Spec here.

More context / discussion: https://github.com/Domain-Connect/Templates/pull/483

This template allows us to:

• set TXT ownership record on any name, including the root (@)
• specify groupIds to allow setting hosting records (A records), TXT, or CNAME verification records separately
• use a different logo

Examples

Intended verification record	Query String
CNAME _verify.example.com -> 123.canva.com	domain=example.com&verify-cname-name=_verify&verify-cname-value=123.canva.com&groupId=hostingA,verificationCname
TXT @ -> verify=123	domain=example.com&verify-txt-value=verify%3D123&groupId=hostingA,verificationTxt**

**Using %3D as the = symbol.

Test

Using https://pdnsadmin.revproxy.short-lived.de/dc/free/templateedit#tbl_records_and_errors

[github-actions[bot]]

Linter OK:

Linter result for canva.com.website-v2.json

[tomnugent]

This is now ready for review, thanks in advance!