Optional New Syntax

[hartym]

On top of the current stable Graph API (mostly based on the .add_chain() method), build a new operator-based API that allows to write more readable code, inspired by the Airflow syntax (although it's quite different, we'll use the same operators to make people more comfortable when using either or both systems).

The syntax is implemented for quite some time in the develop branch, but we need to stabilize, add more tests and implement all kind of use cases one can think of.

[hartym]

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Issues in this epic:

Title	Milestone	Assignees	Stage	State
New Syntax as Default #346	0.9	N/A	Open
Allow bonobo.run to use a cursor, so the get_graph() function can be way simpler #340	N/A	hartym	Open
Update templates to use new syntax #339	0.7	hartym	Closed
New Syntax: Add a branch inbetween #329	0.7	N/A	Closed
New Syntax: Create a new origin #328	0.7	N/A	Closed
New Syntax: Connect two points #327	0.7	N/A	Closed
New Syntax: Multiple forks #326	0.7	N/A	Closed
New Syntax: Send output to existing #325	0.7	N/A	Closed
New Syntax: Merges #324	0.7	N/A	Closed
New Syntax: Forks #323	0.7	N/A	Closed
[doc] Use cases of building a graph #322	0.7	N/A	Closed

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