add mechanism to check for processing progress at schema level

[ttngu207]

Add new method progress for the schema object, returning the populate progress for all imported/computed tables for a given schema (also accounts for reserved, error, ignore jobs)

[guzman-raphael]

@ttngu207 Perhaps we should consider utilizing populate's progress? You should be able to call this to determine the table populate status.

[ttngu207]

@guzman-raphael , the problem with table.progress() is that it is not taking into account entries in the jobs table (e.g. reserved, error, ignore).

[guzman-raphael]

Right, just thinking how we can report progress consistently at the table level and the schema level.

[ttngu207]

Yeah, ideally we'd fix the .progress() at the table level to account for reserve, error and ignore jobs, but that would break backward compatibility.

[guzman-raphael]

We can introduce an option to return as pandas too but have it default to the current behavior.

[ttngu207]

You mean for the new schema.progress() to return a query expression instead of pandas dataframe?