Feature/Create export_face_landmark.py

[AnthonyByansi]

Description

Fixes #11226

• Adds a new script to convert face_landmark.tflite to face_landmark.pb
• Uses tf.lite.TFLiteConverter to convert the model
• Saves the converted model as face_landmark.pb

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)

Checklist

• [X] I have signed the Contributor License Agreement.
• [X] I have read guidelines for pull request.
• [X] My code follows the coding guidelines.
• [X] I have performed a self code review of my own code.
• [X] I have commented my code, particularly in hard-to-understand areas.
• [X] I have made corresponding changes to the documentation.
• [X] My changes generate no new warnings.
• [X] I have added tests that prove my fix is effective or that my feature works.

[LakshmiKalaKadali]

Hi @yeqingli,

Could you please review this PR. Thank You

[yeqingli]

Please submit customized script that is used for your own project to your specific repo. The script include hardcoded file names, which is not the common function needed for this repo.