fix: Added exception re-raise in httpx method overwrites

[Rafal-Chrzanowski-IBM]

Fixes #866.

Added exception re-raise after exception has been recorded.
Previously pylance showed the following warning:

Function with declared return type "Response" must return value on all code paths
  "None" is not assignable to "Response"

Currently this warning isn't visible anymore.

[github-actions]

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• a6dd88d: fix: Added exception re-raise in httpx method overwrites

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[GSVarsha]

Hi @Rafal-Chrzanowski-IBM, thanks for the PR!
According to our spec, we aren't supposed to raise exceptions that are caused by our instrumentation code. But I understand that we shouldn't suppress the exceptions coming from the underlying client library as well. Could you please re-raise the exception only for the original wrapped call as in the snippet I've shared below?

Please update the code (for both the methods) and verify from your end if it fixes the issue. We can then review the PR again, thanks!

            try:
                request = args[0]
                _set_request_span_attributes(span, request)  # Has its own try-except
                tracer.inject(span.context, Format.HTTP_HEADERS, request.headers)
            except Exception:
                logger.debug("httpx handle_request_with_instana:", exc_info=True)
            
            try:
                response = wrapped(*args, **kwargs)
            except Exception as e:
                span.record_exception(e)
                raise
            
            _set_response_span_attributes(span, response)  # Has its own try-except

[Rafal-Chrzanowski-IBM]

Hi @GSVarsha, thank you for taking a look so quickly. I updated the code according to your suggestions. Please let me know whether I should make any further changes to the PR. Thank you.