generate addon for elastic cloud

[AveryQi115]

Signed-off-by: Nicola115 [email protected]

Description of your changes

generate addon for elastic cloud

How has this code been tested?

vela addon enable ./addons/terraform-ec EC_API_KEY=xx

Checklist

I have:

• [ ] Title of the PR starts with type (e.g. [Addon] or [Trait]).
• [ ] Updated/Added any relevant [documentation] and [examples].
• [x] Unit/E2E Tests added.

[zzxwill]

• We have a new way to generate a Terraform addon, please refer to https://kubevela.net/docs/platform-engineers/addon/terraform
• Please add at least one cloud resource for the addon
• Please snapshot a cli or web console or web to show one or more cloud resources are successfully provisioned.

[AveryQi115]

• We have a new way to generate a Terraform addon, please refer to https://kubevela.net/docs/platform-engineers/addon/terraform
• Please add at least one cloud resource for the addon
• Please snapshot a cli or web console or web to show one or more cloud resources are successfully provisioned.

add resource to further verify the addon.