indexer-alt: detect and warn against unrecognised fields. #20463
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Description
Add an extra flattened generic,
toml::Table
to every file-based config struct to pick up any flags that were not recognised by the indexer.Extra fields will be logged as a warning and then ignored when processing flags, so that we are aware of potential typos, but will not cause an error to preserve some form of backwards compatibility (e.g. imagine a new pipeline is added to the indexer, and we update its TOML and try and run an old version of the indexer with the config that mentions the new pipeline).
Test plan
Try merging together some configs that contain typos in them:
STDERR:
STDOUT:
Stack
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