Script to fill missing HubSpot contact IDs and sync email addresses

[heyheyjp]

Related: #184.

We need a script that will attempt to set the HubSpot contact ID for any users in IDM without one. It should also check and sync primary email addresses for all users.

Requirements:

• is idempotent (can be run any number of times and will produce the same result -- hubspot VIDs stored in idm & idm IDs stored in hubspot)
• checks/updates cross-refs between idm & hubspot regardless of whether or not values are already stored
• if syncing for a single user fails, catch, log a warning, and process to next user

[heyheyjp]

Blocked pending review & merge of PR for #184.