Add option to customise names of grid tasks.

When running tasks in a grid, a number is appended at the end of the tasks product names. For example, the following pipeline.yaml file:

- source: example_task.py
   name: example-task
   product:
       data: output/output_dataframe.csv
   grid:
       input_dataframe: ['birds.csv', 'fish.csv', 'flowers.csv']

would result in 3 products: output_dataframe-1.csv, output_dataframe-2.csv and output_dataframe-3.csv.

I would like to have an option to replace -1, -2 and -3 in the filenames with for example -birds, -fish and -flowers.

[hornste]

I like the product_suffix as well. Would be nice to apply to task_suffix as well.

That way if you had something like:

grid:
   param1: [1,2,3,4]
   param2: [a,b,c,d]

you could do, product_suffix: ‘-{{param1}}-{{param2}}’

[hornste]

Yes, definitely would be helpful that you could have it anywhere in the product path, whether it was a directory name or part of the file name.

product: data: output/[[input_dataframe]]/one.csv data2: output/[[input_dataframe]].csv data3: output/testing.[[extension]]

so could be a prefix, suffix, directory name, etc. and of course, would need to be able to use more than one of them at once.

product: data: output/[[dir]]/[[filename]].[[extension]]