Write a helper function to return the hash of a dolt table at a specific branch commit

[n8layman]

It would be useful to add a helper function, maybe dolthub_table_hash(), that can retrieve the hash of a specific table. This would allow for targets to check if a table has been updated as a part of the workflow. Checking a table hash can be done using the DOLT API via something like SELECT SHA1('aido_diseases') which could be combined with AS OF to check the hash of a table at one commit against the hash of a table at another. I don't think DOLT has checksum but SHA1() does work.

This might also be useful as a targets factory, i.e. tar_dolthub_table(),

from @noamross:

It would create two targets, the first checking the SHA of the table, and the second, depending on it, fetching the table.https://wlandau.github.io/targetopia/contributing.html#target-factories
R Targetopia