Support NeedData responses in SourceMap/SourceMapTrace ContentSources (#3907)
This implements a new `ContentSourceProcessor` trait and
`WrappedContentSource` struct that allows our `ContentSource`s to
register some processor to transform the eventual `ContentSourceContent`
that an inner `ContentSource` returns. Yah, it's a bit of a mouthful
with lots of very similar sounding names.
Essentially, the old `SourceMapContentSource` and
`NextSourceMapTraceContentSource` wrapped some inner `ContentSource`,
and would request content from them, and process that content into a
source map JSON or trace JSON. But, they didn't implement the `NeedData`
response, so it only supported very primitive inner content sources.
This PR extracts that knowledge into a single `WrappedContentSource`,
which will recursively wrap every `ContentSourceResult` until we land on
a fully resolved `ContentSourceResult::Result`. At that point, it hands
off the work to a `WrappedGetContentSource`, which performs the
processing on whatever content is returned by the inner
`GetContentSourceContent`. If you can't tell yet, I'm making the
description intentionally verbose to highlight just how similar our
struct/trait names are.
Fixes WEB-614
turborepo
a6f92743 - Support NeedData responses in SourceMap/SourceMapTrace ContentSources (#3907)
