Add documentation about state/metadata/vtk_fields node

Spiros Tsalikisrequested to merge
spiros.tsalikis/paraview-docs:add-conduit-metadata-vtk-fields-documentation into master

Add documentation about state/metadata/vtk_fields node

This MR resolves the paraview documentation side of paraview#22839 (closed).

Edited by Spiros Tsalikis

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