observability: add custom tags and location tags #5234
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* Split the config parsing and project id fetching * Removed emit function * Reworded related comments * Updated test logic
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This PR fills the last piece of feature required by Preview Preview: https://screenshot.googleplex.com/Ay9dFqFHh2TdzQJ.
Custom tags: the plugin reads all environment variables, if one of them starts with "GRPC_OBSERVABILITY_", it will tag the suffix as label key and value as label value in every log entries.
Location tags: the logging SDK automatically handles this, see code.
Parent PR #5233