[refactor] Move columnDescriptors to DataProvider (and use initial value)

[severo]

To reduce the number of rerenders + fix the value to the initial value (we don't have a mechanism to update the columns name, sortable property or number)

see #449

[Copilot]

Pull request overview

Refactors column descriptor handling so column descriptors (and derived column count) are owned by DataProvider and treated as “initial, stable” values to reduce re-renders and avoid unsupported runtime updates to column descriptor properties (per #449).

Changes:

• Add ColumnDescriptorsContext to DataProvider and initialize it from the data frame’s initial columnDescriptors.
• Update ColumnParametersProvider to read column descriptors from DataContext instead of receiving them as a prop.
• Update affected tests and HighTable wiring to align with the new context-driven API.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/providers/ColumnParametersProvider.test.tsx	Wraps ColumnParametersProvider in ColumnDescriptorsContext.Provider for updated dependency.
src/providers/DataProvider.tsx	Introduces ColumnDescriptorsContext provider and stores initial column descriptors for stability.
src/providers/ColumnParametersProvider.tsx	Switches to useColumnDescriptors() and removes columnDescriptors prop.
src/contexts/DataContext.ts	Adds ColumnDescriptorsContext and useColumnDescriptors() hook.
src/components/HighTable/HighTable.tsx	Removes passing data.columnDescriptors into ColumnParametersProvider; relies on DataProvider.
src/components/ColumnHeader/ColumnHeader.test.tsx	Updates test setup to provide ColumnDescriptorsContext.

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