Feature request: Connect to SFDX scratch org

[stevevg]

As a feature request, I would like to be able to pull data from a scratch org created by SFDX, in order to test the functionality of the plugin before going to a partial/full sandbox.

I suggest to introduce a new string configuration parameter (similar to the current use_test_sandbox boolean), which causes the plugin to connect to a "custom" url, i.e. the URL of the scratch org.

[mkreth]

@stevevg please see the new sfdc_instance_url parameter introduced in version 3.1.0 of the plugin.

I could successfully connect to and read data from a scratch org using this new configuration parameter. Some steps to do in the scratch org before this works:

• Generate a password for your user - see https://developer.salesforce.com/docs/atlas.en-us.sfdx_dev.meta/sfdx_dev/sfdx_dev_scratch_orgs_passwd.htm
• Reset your Security Token
• Create a Connected App to use during authentication and assign it to (your/the) user