fix(metrics): assign start_time_unix_nano for Gauge metrics in SDK and encoders (#5849) - #5852

fix(metrics): assign start_time_unix_nano for Gauge metrics in SDK and encoders (#5849)#5852

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ImamWahyudiz:fix/sdk-gauge-start-time-5849ImamWahyudiz/opentelemetry-python:fix/sdk-gauge-start-time-5849Copy head branch name to clipboard