[Addon] add statefulset to datadog and keyvault

[madibaT]

Description of your changes

Added support for statefulset on the datadog and keyvault csi driver by updating the "appliesToWorkloads" field.

How has this code been tested?

tested locally with the "vela dry-run -d kubevela -f app.yml --offline" The output yaml file had the information from the 2 traits.

Checklist

I have:

• Title of the PR starts with type (e.g. [Addon] , [example] or [Doc]).
• Updated/Added any relevant documentation and examples.
• New addon should be put in experimental.
• Update addon should modify the version in metadata.yaml to generate a new version.

Verified Addon promotion rules

If this pr wants to promote an experimental addon to verified, you must check whether meet these conditions too:

• This addon must be tested by addon's e2e-test to guarantee this addon can be enabled successfully.
• This addon must have some basic but necessary information.
  • An accessible icon url and source url defined in addon's metadata.yaml.
  • A detail introduction include a basic example about how to use and what's the benefit of this addon in README.md.
  • Also provide an introduction in KubeVela documentation.
  • It's more likely to be accepted if useful examples provided in example dir.