refactor: replace httr and xml2 dependencies from SDA_query with base R #433
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For soilDB 2.9.x milestone, to be merged into #426 if testing succeeds.
Draft PR to remove dependency on httr and xml2 within SDA_query. httr is basically just syntactic sugar around curl, and xml2 is only needed for parsing
ServiceExceptions when errors occur. jsonlite (or perhaps yyjsonr replacement) can be moved to imports. That way any installation of soilDB with imports only can run SDA_query without installing any additional packages.