Add support for v2 tokens introduced in NetBox 4.5.0

[arthanson]

Fixes: #728

• Added support for v2 tokens.
• Added tests for the tokens
• Cleaned up some ruff check issues.

Simple script to test - update the token:

import pynetbox

nb = pynetbox.api(
    "http://127.0.0.1:8000/",
    token="nbt_jmEaR2a9bQGn.c9ikyDRw46SMH8JeUrBURGKDuNw8imW15nGkFxoE",
    threading=True,
)


sites = nb.dcim.sites.all()
for site in sites:
    print(site)