Create a reverse lookup to find the dataset corresponding to a datastore table

[rovcase]

Improved functionality (not a fix)

Describe your changes

• Adds a command to Drush that takes a data store table name (IE: datastore_1cc649587284c4bf29ada1cc2e58b00d) and out puts the dataset's UUID that is associated with it.
• Update DKAN drush command documentation with the new command and information about it

QA Steps

• run drush dkan:datastore:reverse-dataset-lookup [data table name here]
• Confirm the CLI output shows the correct associated resource ID, Distribution ID, and Dataset UUID.
• Confirm that entering a data table name that does not exist as an argument displays in CLI: Can not map data table to dataset: [non existent name entered here]

Checklist before requesting review

If any of these are left unchecked, please provide an explanation

• I have updated or added tests to cover my code
• I have updated or added documentation

[rovcase]

Hello,
The is functionally complete but I am getting a knock in code climate that it is too complex. Not particularly sure what that means/how I'd go about reducing the complexity considering what is necessary to get this to work, but hoping getting this looked at by someone else might help. Thanks!

[rovcase]

Pulling this back to draft to work on the failing tests. Apologies...