feat: implement resource actions clients

[jooola]

This implements the new per resources actions endpoints.

Related to https://docs.hetzner.cloud/changelog#2023-06-29-resource-action-endpoints

# Existing API
client.actions.get_by_id() # /actions/{id}
client.<resource>.get_actions_all() # /<resource>/{resource_id}/actions
client.<resource>.get_actions_list() # /<resource>/{resource_id}/actions

# New API
client.<resource>.actions.get_all() # /<resource>/actions 
client.<resource>.actions.get_list() # /<resource>/actions
client.<resource>.actions.get_by_id() # /<resource>/actions/{id}

# Not planned
client.<resource>.get_action_by_id() # /<resource>/{resource_id}/actions/{id}

# Deprecated
client.actions.get_all() # /actions
client.actions.get_list() # /actions

One exception is the primary IPs client, it doesn't include calls to /<resource>/{resource_id}/actions or /<resource>/{resource_id}/actions/{id}: https://docs.hetzner.cloud/#primary-ip-actions

[apricote]

Nice 🥳