v5.16.0 - #409

…command usage (#397)

* change directory structure and makefile usage

* remove unnecessary init files

* remove unnecessary init files

* add tests for oauth and login client

* remove duplicate lines

## 📝 Description

**What does this PR do and why is this change necessary?**

Updates `pyenv` to point to local environment setup by devenv.

* replace execution handler with conditional

* adding if statement

## 📝 Description

This pull request adds support for configuring and viewing the ACL configuration for an LKE cluster's control plane.

**NOTE: This PR does NOT include the PUT LKE cluster changes because the acl configuration is not returned in the GET LKE cluster response.**

#### New Endpoint Methods

* `control_plane_acl` - GET `/lke/clusters/{cluster_id}/control_plane_acl`
* `control_plane_acl_update(...)` - PUT `/lke/clusters/{cluster_id}/control_plane_acl`
* `control_plane_acl_delete()` - POST `/lke/clusters/{cluster_id}/control_plane_acl`


#### Updated Endpoint Methods

* `LKEGroup.cluster_create(...)` - Add control_plane field to method arguments

#### Misc Changes

* Added data classes for LKE cluster control plane and all substructures
* Added logic to JSONObject to remove `Optional` values from the generated dict if None
    * Added a new `always_include` class var used to designate optional values that should always be included in the generated Dict
* Updated test fixture framework to support underscores in path

## ✔️ How to Test

The following test steps assume you have pulled down this PR locally and run `make install`.

### Unit Testing

```
make testunit
```

### Integration Testing

```
make TEST_COMMAND=models/lke/test_lke.py testint
```

### Manual Testing

In a Python SDK sandbox environment (e.g. dx-devenv), run the following:

```python
import os

from linode_api4 import (
    LinodeClient,
    LKEClusterControlPlaneOptions,
    LKEClusterControlPlaneACLOptions,
    LKEClusterControlPlaneACLAddressesOptions,
)

client = LinodeClient(token=os.getenv("LINODE_TOKEN"))

cluster = client.lke.cluster_create(
    "us-mia",
    "test-cluster",
    client.lke.node_pool("g6-standard-1", 1),
    "1.29",
    control_plane=LKEClusterControlPlaneOptions(
        acl=LKEClusterControlPlaneACLOptions(
            enabled=True,
            addresses=LKEClusterControlPlaneACLAddressesOptions(
                ipv4=["10.0.0.1/32"], ipv6=["1234::5678"]
            ),
        )
    ),
)

print("Original ACL:", cluster.control_plane_acl)

cluster.control_plane_acl_update(
    LKEClusterControlPlaneACLOptions(
        addresses=LKEClusterControlPlaneACLAddressesOptions(ipv4=["10.0.0.2/32"])
    )
)

print("Updated ACL:", cluster.control_plane_acl)

cluster.control_plane_acl_delete()

print("Deleted ACL:", cluster.control_plane_acl)
```

2. Ensure the script runs successfully and the output matches the following:

```
Original ACL: LKEClusterControlPlaneACL(enabled=True, addresses=LKEClusterControlPlaneACLAddresses(ipv4=['10.0.0.1/32'], ipv6=['1234::5678/128']))
Updated ACL: LKEClusterControlPlaneACL(enabled=True, addresses=LKEClusterControlPlaneACLAddresses(ipv4=['10.0.0.2/32'], ipv6=None))
Deleted ACL: LKEClusterControlPlaneACL(enabled=False, addresses=None)
```

 new: Add support for Parent/Child account switching

* unskip lke test, update test_lke_node_recycle, filter swap disk for image create, skip parent child account test

* skip pc account test

* remove comment

* update with cleaner syntax