API key support

🚨 Breaking changes

	Title	Issue/PR	Description
1	providers.yaml schema	#322	Proxy-related fields are now nested under the proxy field.

✨ New features

	Title	Issue/PR	Description
1	API keys	#322	Support API keys and Basic auth to authorize APIs.
2	Unit tests	#273	Add unit tests to Nango (about 30 so far)
3	Mixpanel	#608	Added support for the Mixpanel API.
4	Amplitude	#609	Added support for the Amplitude API.
5	Gong	#826	Added support for the Gong API.
6	Ashby	#826	Added support for the Ashby API.
7	Workable	#826	Added support for the Workable API.
8	Shortcut	#322	Added support for the Shortcut API.
9	Zoho	#814	Added support for Zoho's various API (Books, Invoices, Inventory, CRM, etc.).
10	init command	#815	The nango init command now generates a fully-functional Github integration example.
11	Dynamic proxy URLs	#816	Support string interpolation in Proxy base URLs, using the connection configuration
12	Error handling	#783, #750	Improve error handling, particularly for external API errors.
13	Windows compatibility	#788	Make the Nango CLI compatible with Windows

🐞 Bug fixes

	Issue/PR	Description
1	#804	Remove notion2 test integration.
2	#715	Prevent syncs from re-ordering when paused.
3	#716	Prevent triggering syncs from logging twice in the Activity tab.
4	#766	Fix Activity tab log links (broken by the introduction of environments).
5	#720	Fix bug where the next sync time was unreliable.
6	#761	Connection raw field has the wrong type.