[feature][connector-mock] GAL-454 支持MockSource

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+# Mock
+
+> Mock source connector
+
+## Description
+
+Mock source connector is used to generate data. It is useful for testing.
+
+## Source Options
+
+File source custom properties.
+
+| Name                | Type    | Required | Default | Description                                                                                    |
+|---------------------|---------|----------|---------|------------------------------------------------------------------------------------------------|
+| mock.desc.file.path | String  | Yes      | (none)  | mock schema file path.                                                                         |
+| rows.per.second     | Integer | No       | 1000    | Rows per second to control the emit rate.                                                      |
+| number.of.rows      | Long    | No       | -1      | Total number of rows to emit. By default, the source is unbounded.                             |
+| millis.per.row      | Long    | No       | 0       | Millis per row to control the emit rate.  If greater than 0, rows.per.second is not effective. |
+
+## Example
+
+This example mock source and print to console.
+
+```yaml
+sources:
+  mock_source:
+    type : mock
+    properties:
+      mock.desc.file.path: './mock_example.json'
+      rows.per.second: 1
+
+sinks:
+  print_sink:
+    type: print
+    properties:
+      format: json
+
+application:
+  env:
+    name: mock-to-print
+    parallelism: 2
+    pipeline:
+      object-reuse: true
+  topology:
+    - name: mock_source
+      downstream: [ print_sink ]
+    - name: print_sink
+      downstream: [ ]
+```
+
+