Expect query stream error case

[suranyami]

We encountered a case where a query_stream can return an :error.

For us it occurred when an SObject had fields that had been renamed since the last time we connected and we had used a query for an old field name.

We have added case statements for the possible :error return state.

Because ex_force was not expecting a {:error, something} result, it would throw a runtime exception, which would bring down the parent GenServer.

We will now be able to expect a possible :error return ourselves and handle gracefully. In our specific case, we will make a new metadata SOAP request to update the known field names for the objects we wish to query. This is a side-effect of not being able to issue SELECT * FROM something queries in Salesforce query language.

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SourceLevel has finished reviewing this Pull Request and has found:

• 1 possible new issue (including those that may have been commented here).

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[coveralls]

Coverage decreased (-2.3%) to 97.727% when pulling b948f681a90e8cde87af18984c852389d99db435 on workplacearcade:expect-query-stream-error-case into 49b26022940a504a9146ec4ce9a5b5493c7247fc on chulkilee:main.

[suranyami]

Closing this PR, because #50 does a better job of making the returns consistent.