feat: Add kafka connect resource

[qboileau]

Create new conduktor_kafka_connect_v2 resource that support Conduktor Console Kafka Connect configurations.

Usage

resource "conduktor_kafka_connect_v2" "basic" {
  name    = "basic-connect"
  cluster = conduktor_kafka_cluster_v2.minimal.name
  labels = {
    description   = "This is a complex connect using basic authentication"
    documentation = "https://docs.mycompany.com/complex-connect"
    env           = "dev"
  }
  spec {
    display_name = "Basic Connect server"
    urls         = "http://localhost:8083"
    headers = {
      X-PROJECT-HEADER = "value"
      Cache-Control : "no-cache"
    }
    ignore_untrusted_certificate = false
    security = {
      type     = "BasicAuth"
      username = "user"
      password = "password"
    }
  }
}

This PR add :

Resource terraform schema
Resource Console API models
Mapping between models
Terraform Resource implementation
Resource tests
Resource Examples
Resource documentation