Simulator restricted network support for tiktoken

[aerjenn]

This pull request primarily focuses on enabling the simulator to function in environments with varying levels of network access. It introduces three networking scenarios: unrestricted, semi-restricted, and restricted network access. The changes also include the addition of a new Python script to set up TikToken cache and modifications to the Dockerfile to handle different network access scenarios.

Major changes include:

Updates to README.md:

• README.md: Added a new section "Using the simulator with restricted network access". It explains how the simulator can function in three different networking scenarios and the build arguments required for each scenario. [1] [2]

New Python Script:

• scripts/setup_tiktoken.py: A new Python script has been added to download the TikToken encoding file and save it in the tiktoken_cache directory. This script is particularly useful in a restricted network access scenario.

Dockerfile Modifications:

• src/aoai-simulated-api/Dockerfile: The Dockerfile has been updated to handle different network access scenarios. It uses build arguments to determine the network type and sets up the TikToken cache accordingly.

Removal of Dependencies:

• src/aoai-simulated-api/requirements.txt: All dependencies have been removed from the requirements.txt file, since a pyproject.toml file with the dependencies is already available.

[stuartleeks]

@aerjenn - this looks good to me.

I see that the CI is failing as it runs make install-requirements which is looking for the src/aoai-simulated-api/requirements.txt

[aerjenn]

@aerjenn - this looks good to me.

I see that the CI is failing as it runs make install-requirements which is looking for the src/aoai-simulated-api/requirements.txt

Re-added the requirements.txt for now