new feature: support parameters and data driven

tests/data/app_version.csv

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+app_version
+2.8.5
+2.8.6
+

tests/data/demo_parameters.yml

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+- config:
+    name: "user management testset."
+    parameters:
+        - user_agent: Random
+        - app_version: Sequential
+    variables:
+        - user_agent: 'iOS/10.3'
+        - device_sn: ${gen_random_string(15)}
+        - os_platform: 'ios'
+        - app_version: '2.8.6'
+    request:
+        base_url: $BASE_URL
+        headers:
+            Content-Type: application/json
+            device_sn: $device_sn
+    output:
+        - token
+
+- test:
+    name: get token with $user_agent and $app_version
+    api: get_token($user_agent, $device_sn, $os_platform, $app_version)
+    extract:
+        - token: content.token
+    validate:
+        - "eq": ["status_code", 200]
+        - "len_eq": ["content.token", 16]

tests/data/user_agent.csv

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+user_agent
+iOS/10.1
+iOS/10.2
+iOS/10.3

tests/data/username-password.csv

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+username,password
+test1,111111
+test2,222222
+test3,333333