[APP][ACTIONS] Bill.com app integration, Bill New Actions

**Name of app / service**
Bill.com

**Link to developer documentation**
https://developer.bill.com/

**Is lack of support preventing you from building workflows, or do you have a workaround?**
We can store the all the auth data in environment variables for now and build the integration using nodejs components.

**Are there specific actions, or triggers, you'd like to see for this app? Please let us know here or use the Action and Trigger issue templates to open requests for each!**
Auth is most important, but we're looking to sync bills + vendors. We can also assist in building these out.
- Create a vendor
- List Vendors
- Read a Vendor
- Update a vendor
- Create a bill
- Read a bill
- List bills
- update a bill