Dev/aamstutz/domain missing resources

[amstuta]

Description

Added two resources for OVH domains (based on the initial PR #818):

• ovh_domain_name_servers: Resource to set external name servers for a domain.
• ovh_domain_ds_records: Resource to set ds_records for a domain

Fixes #146 (issue)

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Test A: make testacc TESTARGS="-run TestAccDomainNameServers_Basic"
• Test B: make testacc TESTARGS="-run TestAccDomainDsRecords_Basic"

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or issues
• I have added acceptance tests that prove my fix is effective or that my feature works
• New and existing acceptance tests pass locally with my changes
• I ran succesfully go mod vendor if I added or modify go.mod file