[flutter_plugin_tools] Reimplements the excerpt system inline in the tool, rather than relying on a separate package. (#4417) * Allows excerpts to come from any package, not just examples. * Fixes a bug in the excerpting logic that was causing a stray `}` to appear in one example. * Removes the need for `build.excerpt.yaml` files. * Remove the dependency on build_runner for excerpts. * Reduces the time to generate the excerpts from about 10 minutes to about 5 seconds. * Almost certainly fixes https://github.com/flutter/flutter/issues/107180 (untested). The new logic is not quite backwards compatible; the `path-base` feature now specifies a real path to the actual source directories, rather than a path into the invisible generated `excerpts/` directory with its special structure. Also, a number of features from the previous package that were not actually used in this repository are no longer supported (such as having multiple section names per `#docregion` pragma).
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