provider filter missing in OpenAPI documentation

[alambare]

Describe the bug EODAG server supports a filter parameter provider. The provider does not show up in the API documentation.

This filter is available for:

• /collections
• /collections/{collectionId}
• /collections/{collectionId}/items
• /collections/{collectionId}/items/{featureId}
• /queryables
• /queryables/{collectionId}
• /search GET and POST
• /catalogs/{catalogPath}
• /catalogs/{catalogPath}/items
• /catalogs/{catalogPath}/items/{featureId}

[alambare]

related to https://github.com/CS-SI/eodag/issues/941