Vendor RESTfly Version 1 for Legacy codebase #988 #989

[SteveMcGrath]

Description

Vendors the previously separate RESTfly version 1 library in order to lock in the existing legacy code to a known
version of the library while allowing for the newer refactored components to take advantage of the newer version 2
capabilities.

This is a dependency to unblock the modernization project and ensure that any RESTfly changes do not meaningfully
impact the existing codebase.

Addresses #988 and #989

Type of change

Chore work to decouple pyTenable from the requests-based RESTfly.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unit Tests Pass
• Manual validation of export APIs performed.

Test Configuration:

• Python Version(s) Tested: 3.11+

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules