Created by: chenwhql

In order to verify the effect of Paddle Error Message Writing Specification, this PR adds a script to count the number of PADDLE_ENFORCE{**} and PADDLE_THROW entries, run this script to get the total number of PADDLE_ENFORCE{**} and PADDLE_THROW entries, the number of valid entries and the number of invalid entries.

The example:

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PADDLE ENFORCE & THROW COUNT
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All PADDLE_ENFORCE{_**} & PADDLE_THROW Count: 5650
Valid PADDLE_ENFORCE{_**} & PADDLE_THROW Count: 23
Invalid PADDLE_ENFORCE{_**} & PADDLE_THROW Count: 5627