Two addition filter for image captions

[BeachWang]

1. text_action_filter: Filter to keep texts those contain actions in the text.
2. text_entity_dependency_filter: Identify the entities in the text which are independent with other token, and filter them.
   The text containing no entities will be omitted.

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ BeachWang
❌ root

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