[Feature]: Table view with chosen columns, filters and CSV export  #72

What type of issue is this?

• Bug report
• Feature request

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of the reqifviewer
• I have searched open and closed issues to ensure it has not already been reported

Description

Acceptance criteria

• A specification, or all requirements, as a Blueprint Data Grid: choose attribute columns, sort, filter (text, enumeration values), group by an attribute.
• Export the current view to CSV (and Excel if cheap).

Steps to Reproduce

NA

System Configuration

• reqifviewer version: 6.1.0 (development, with [Refactor] Blazor Blueprint app shell and Blazor Web App hosting #56)
• Environment (Operating system, version and so on): Windows 11, Chrome
• .NET Framework version: .NET 10
• Additional information: Plan item R-06 of the viewer improvement plan. Size: M. Depends on: [Feature]: Readable labels for requirements: detect the id and text attributes  #68, [Feature]: Migrate the pages from Radzen to Blazor Blueprint  #62.