Enhanced code to extract and parse specific config files from TorchScript archive

[MMelQin]

Per bug report, the Config Parser needs to parse the full list of configs all at once.

• As before, try to avoid extracting files to tmp dir, so if only one item is needed, directly read from the archive (into bytes). The helper function to extract content directly from a single file in the archive has been enhanced to try both supported file types, e.g. .json and .yaml.
• When list of config (files) are need to be parsed
  • considered using mem mapped files to hole content retrieved from the archive, however, the underlying config parser function, load_config_file, does not support mmap type
  • have to use tempfile.TemporaryDirectory as destination for extracting only the files for the named configs, both .json and .ymal will be tried, first match wins
  • Tested with sample app which was updated to illustrate the use of setting config_names even though currently only inference is needed, beside metadata

Signed-off-by: M Q [email protected]

[sonarqubecloud]

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