Support for keepers attribute for tls_private_key to allow for automatic rotation

[oboukili]

Hello,

To allow for automatic private keys rotation in conjunction with the time provider, the tls_private_key attribute should support an arbitrary keepers map attribute that would trigger the resource recreation upon change.

Affected Resource(s)

Please list the resources as a list, for example:

• tls_private_key

Expected

resource "time_rotating" "example" {
  rotation_days = 3
}

resource "tls_private_key" "example" {
  algorithm   = "ECDSA"
  ecdsa_curve = "P384"
  keepers = {
    rotation = time_rotating.example.rotation_rfc3339
  }
}