[new]: `export_to_bigtable(project, table, key, value)`

[unytics]

Check the idea has not already been suggested

• [X] I could not find my idea in existing issues

Edit the title above with self-explanatory function name and argument names

• [X] The function name and the argument names I entered in the title above seems self explanatory to me.

BigFunction Description as it would appear in the documentation

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Examples of (arguments, expected output) as they would appear in the documentation

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