[DEVX-300] Support PAT as arg

[sainivedh]

What

• Support PAT as parameter while initialising resources in addition to setting as env variable
• Changed necessary methods in Inputs class to staticmethods

How

model = Model(url="https://clarifai.com/openai/chat-completion/models/GPT-3_5-turbo", pat="CLARIFAI_PAT")


print(model.predict_by_bytes(b"Hello World", "text"))

Tests

• Initialised respective User, App, Model, Workflow classes w.r.t PAT in test_app.py, test_model_predict.py and workflow/test_predict.py

[isaac-chung]

Much cleaner! One discussion comment.