Support start_time and end_time query parameters

[nrozanov]

Description

Support start_time and end_time query parameters for GET /assets/<id> call

Look & Feel

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How to test

Pass new parameters to GET /assets/<id>, check we get data that is more recent than start_time and older than end_time

Further Improvements

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Related Items

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• [x] I agree to contribute to the project under Apache 2 License.
• [x] To the best of my knowledge, the proposed patch is not based on code under GPL or other license that is incompatible with FlexMeasures