[WIP] feat: company analytics

[lastcanal]

This PR implements the company analytics query for the admin dashboard

Some info is not in there yet, such as avg_time_to_fill. Haven't figured out exactly where that info is just yet.

I made some assumptions as to what 'active' orgs and 'successful' contracts are. With this an org is active if it's activated and a contract is successful if it's status is paid or active

last_active_at is currently just using Org#updated_at. We might want to "touch" Org#updated_at on login, or add a last_active_at field to the User/Org model.

It also includes some other random fixes

[zcesur]

Looking good! Let's agree on a common terminology before putting more work @lastcanal @IoannisFlo, I suggest:

• active org: org who triggered a GMV event in given period
• GMV events: bounty.created, bounty.rewarded, contract.payment_escrowed, contract.payment_released etc.
• successful contract: currently active or paid contract
• avg time to fill: time from published to accepted, avg over all successful contracts (excl. renewals)

For the last 2, we'll need to add some new fields to contract schema. How about

• in open contracts (contracts w/o contractor_id) we track :published_at
• in filled contracts (contracts w/ contractor_id) we track both :published_at (inherited) and :accepted_at

[lastcanal]

All of that sounds good! I know this is just an admin view but I wanted to get @IoannisFlo some real data from the get go. I'm working on the notifications now and will be touching most of these events; I might add a User#last_active_at column to make the queries a little simpler and 'touch' it when the 'event' get added to the feed.

[zcesur]

Yep that sounds good!

[zcesur]

Hey! Is there anything left to do here?

Can totally skip time_to_fill for now