[Feat]: Expose data accessors and methods for controlling table column visibility

[nangelov-eti]

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Is your feature request related to a problem? Please describe. Yes. Currently, the table component does not expose metadata or accessors for hidden column data, nor does it offer a programmatic way to control column visibility.

1. Persistence of user preferences: It is not possible to store and reapply the user's column visibility preferences between page visits or sessions.
2. Data export limitations: When exporting data from the table, there is no built-in way to filter or include only the currently visible columns, since visibility state is not exposed.

Describe the solution you'd like I would like the table component to expose:

1. A property like table.hiddenColumns that returns an array of currently hidden columns.
2. A method such as table.hideColumns(columns: string[]) to hide columns programmatically.
3. A complementary method such as table.showColumns(columns: string[]) to update the visible columns explicitly.