Write multi-measure records to Timestream

[mateogianolio]

Is your idea related to a problem? Please describe.

Can't write multi-measure records?

Describe the solution you'd like

Multi-measure records were added in boto3 1.20.13 (see https://github.com/boto/boto3/blob/develop/CHANGELOG.rst#12013).

Few suggestions on how to solve this:

• replace measure_col with measure_cols (breaks backwards compatibility, so probably no go)
• letting measure_col optionally take list (a bit weird)
• adding a measure_cols parameter to timestream.write() which overrides measure_col
• adding a new method timestream.write_multi()

[jaidisido]

Thanks for flagging this @mateogianolio, it seems that the API call lists both MeasureValue and MeasureValues so I would be in favour of accepting both

Contributions are always welcome if you are keen :)