feat(api): adding BYOK settings for a deployment

[dmitry-pisarev-writerai]

Description

Updating api docs and models with BYOK settings block, which we can send on createDeployment request.
We also receive an information about BYOK settings on getDeployment request.

Related Issues

elastic/terraform-provider-ec#827

Motivation and Context

Need to create an elasticsearch deployment with help of Terraform, and have this deployment encrypted with a customer key (e.g. AWS KMS).

How Has This Been Tested?

The change was tested as part of a custom build of terraform-provider-ec

resource "ec_deployment" "this" {
  name = var.name

  region                     = var.region
  version                    = local.version
  deployment_template_id     = var.deployment_template_id
  migrate_to_latest_hardware = true
  byok_arn                   = var.byok_arn
...

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improves code quality but has no user-facing effect)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Readiness Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

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