Root selector option for CSV/TSV

[yesoreyeram]

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[Copilot]

Pull Request Overview

This PR adds support for applying root selectors (e.g., JSONata, GJSON, JQ) when converting CSV/TSV data to frames and refactors related rootselector logic in the jsonframer and csvframer packages.

• Introduce FramerType and RootSelector in csvframer.FramerOptions plus a new ApplyRootSelector function to transform CSV arrays before framing.
• Update jsonframer/rootselector.go to special-case JSONata argument errors, and expand gframer alias-mapping logic.
• Add golden test fixtures and a test suite for JSONata-based root selectors.

Reviewed Changes

Copilot reviewed 11 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
lib/go/jsonframer/rootselector.go	Added strings import and special handling for JSONata “argument” errors
lib/go/gframer/gframer.go	Expanded alias/mapping condition to also apply when Selector == k
lib/go/csvframer/go.mod	Bumped jsonframer version and added new indirect dependencies
lib/go/csvframer/framer.go	Added FramerType & RootSelector options and new root-selector flow
lib/go/csvframer/framer_test.go	Added new test cases for CSV framing with JSONata root selector
lib/go/csvframer/testdata/with_root_selector_and_JSONata_framer/*	New golden JSONC fixtures covering various root selector scenarios

Comments suppressed due to low confidence (1)

lib/go/csvframer/framer_test.go:93

• The new suite covers only FramerTypeJsonata. Consider adding test cases for other FramerType options like FramerTypeGJSON and FramerTypeJQ to ensure full coverage of the root-selector feature.

	t.Run("with root selector and JSONata framer", func(t *testing.T) {