fix: integer fields are displayed as floats when using describe with o=yaml

[phm07]

When outputting resources in YAML format using describe, some integer fields (like IDs) are interpreted as floating point numbers and are thus unusable. Example output of $ hcloud image describe fedora-39 -o=yaml:

architecture: x86
bound_to: null
created: 2023-11-09T06:19:32+00:00
created_from: null
deleted: null
deprecated: null
description: Fedora 39
disk_size: 5.0
id: 1.35075974e+08 # interpreted as floating point
image_size: null
labels: {}
name: fedora-39
os_flavor: fedora
os_version: "39"
protection:
  delete: false
rapid_deploy: true
status: available
type: system

This is because when running describe, the API response is decoded into a map[string]any. The Go json library defaults to float64 when converting JSON number literals into an any, so in the encoding back to YAML these integer fields are interpreted as floats.

[phm07]

The same is true for metrics and create commands.