File Upload - Implement a property which defines the name of a custom file item preview component

[JaneSjs]

T26785 - Extend view on File Questions
https://surveyjs.answerdesk.io/internal/ticket/details/T26785
T25388 - Opening image uploaded as a file
https://surveyjs.answerdesk.io/internal/ticket/details/T25388
T25020 - Custom File Preview
https://surveyjs.answerdesk.io/internal/ticket/details/T25020
T24600 - File Upload - Save files
https://surveyjs.answerdesk.io/internal/ticket/details/T24600
T26325 - Downloading files issue
https://surveyjs.answerdesk.io/internal/ticket/details/T26325

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