Iqm-client

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* Add optional ``metadata`` field to ``Circuit``. `63 <https://github.com/iqm-finland/iqm-client/pull/63>`_

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* Reduce wait interval between requests to the IQM Server and make it configurable with the ``IQM_CLIENT_SECONDS_BETWEEN_CALLS`` environment var. `62 <https://github.com/iqm-finland/iqm-client/pull/66>`_

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* Retry requests to the IQM Server if the server is busy. `61 <https://github.com/iqm-finland/iqm-client/pull/61>`_

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* Add integration guide. `60 <https://github.com/iqm-finland/iqm-client/pull/60>`_

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* Support OpenTelemetry trace propagation. `59 <https://github.com/iqm-finland/iqm-client/pull/59>`_

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* New external token is now obtained from tokens file if old token expired. `58 <https://github.com/iqm-finland/iqm-client/pull/58>`_