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At the heart of the loop for extracting usages across a Sourcegraph
instance is the `extractLocationsFromPosition` function, which
extracts related symbols and source ranges from a single SCIP
Document. (Source ranges for returning to the user directly,
and related symbols to do further lookups, e.g. in the case
of inheritance.)
Since we want to perform matching based on symbol names in the upcoming
precise usagesForSymbol API, and also return symbol names for each
associated source range, this function needs to be updated to:
1. Be able to take a symbol name for doing lookups. This is done using
the new `FindUsagesKey` type which allows two cases - position-based and
symbol-based.
2. Be able to return symbol names associated with every source range.
This is done by creating a new `UsageBuilder` type which somewhat subsumes
the `Location` type. We avoid copying the same 'UploadID' and 'Path'
fields eagerly for clarity; that will be handled by callers in the future when
they mix `UsageBuilder` values across different Documents (by first calling `build`).
For the above, I've introduced a new func `extractRelatedUsagesAndSymbolNames`,
and `extractLocationsFromPosition` delegates to that. In the future,
`extractLocationsFromPosition` will be removed.
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