Support multiple NodePorts, static NodePort mapping, and add 'replicas' spec option (#913)

NodePort example:

```
network:
  ports:
    caddy:
     - 1234
     - 32020:2020
```

Replicas example:

```
replicas: 2
```

This also adds an optimization for k8s where if a directory matching the name of a configmap exists in beneath config/ in the stack, its contents will be copied into the corresponding configmap.

For example:

```
# Config files in the stack
❯ ls stack-orchestrator/config/caddyconfig
Caddyfile  Caddyfile.one-req-per-upstream-example

# ConfigMap in the spec
❯ cat foo.yml | grep config
...
configmaps:
  caddyconfig: ./configmaps/caddyconfig

# Create the deployment
❯ laconic-so --stack ~/cerc/caddy-ethcache/stack-orchestrator/stacks/caddy-ethcache deploy create --spec-file foo.yml

# The files from beneath config/<config_map_name> have been copied to the ConfigMap directory from the spec.
❯ ls deployment-001/configmaps/caddyconfig
Caddyfile  Caddyfile.one-req-per-upstream-example
```

Reviewed-on: cerc-io/stack-orchestrator#913
Reviewed-by: David Boreham <dboreham@noreply.git.vdb.to>
Co-authored-by: Thomas E Lackey <telackey@bozemanpass.com>
Co-committed-by: Thomas E Lackey <telackey@bozemanpass.com>

stack_orchestrator/deploy/deployment_create.py

@@ -514,6 +514,13 @@ def create_operation(deployment_command_context, spec_file, deployment_dir, netw
             os.mkdir(destination_script_dir)
             script_paths = get_pod_script_paths(parsed_stack, pod)
             _copy_files_to_directory(script_paths, destination_script_dir)
+        if parsed_spec.is_kubernetes_deployment():
+            for configmap in parsed_spec.get_configmaps():
+                source_config_dir = resolve_config_dir(stack_name, configmap)
+                if os.path.exists(source_config_dir):
+                    destination_config_dir = deployment_dir_path.joinpath("configmaps", configmap)
+                    copytree(source_config_dir, destination_config_dir, dirs_exist_ok=True)
+
     # Delegate to the stack's Python code
     # The deploy create command doesn't require a --stack argument so we need to insert the
     # stack member here.