Copy clean_cookie and clean_body cleaners from clearpass_api into this repository in the examples

[edthedev]

Context

We created cleaners for clearpass_api that fully clean an unused cookie, or fully clean an unused response body.

Tasks

• create a new file in our example cleaners folder
• copy in clean_cookie from conftest.py in clearpass_api
• copy in clean_body from conftest.py in clearpass_api
• update README with example usage lines of Python (copied from conftest.py, including example use of clean_if)

[edthedev]

Example code for clean_body, since we really need #30 before it's useful, so it's not likely to merge into clearpass_api today.

@clean_if(uri=f"{URL}/api/endpoint")
def clean_body(request: dict, response: dict):
    response['body'] = '{"status":"success", "data":"cleaned"}'

[edthedev]

Likely blocked by #30 - practically speaking.

[edthedev]

We also have a copy of clean_cookie here: https://github.com/techservicesillinois/secops-splunk-domainblock/issues/1