Openai (#905)

* add cost budget; move loc of make_dir

* support openai completion

* install pytest in workflow

* skip openai test

* test openai

* path for docs rebuild

* install datasets

* signal

* notebook

* notebook in workflow

* optional arguments and special params

* key -> k

* improve readability

* assumption

* optimize for model selection

* larger range of max_tokens

* notebook

* python package workflow

* skip on win

.github/workflows/python-package.yml

@@ -6,8 +6,20 @@ name: Build
 on:
   push:
     branches: ['main']
+    path:
+      - 'flaml/*'
+      - 'test/*'
+      - 'notebook/*'
+      - '.github/workflows/python-package.yml'
+      - 'setup.py'
   pull_request:
     branches: ['main']
+    path:
+      - 'flaml/*'
+      - 'test/*'
+      - 'notebook/*'
+      - '.github/workflows/python-package.yml'
+      - 'setup.py'
 
 jobs:
   build: