Remove usage of node modules from data parsing packages

[cmdcolin]

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current usages

• events and stream from gff and gtf (might be able to make a non-stream version that just operates on string)
• url in nclist (we already published a version without url but it is not used yet because it is hard to get tests passing with this)
• buffer in generic-filehandle (probably largest task)
• fs in gff/gtf

reason for renewed interest:both plain esbuild (which is nice for use with anywidget) and next --turbo. works with vite which uses esbuild under the hood at dev time, but making easier usage everywhere would be good