Block config

[GhislainJ]

• What kind of changes does this PR introduce?

• [ ] Bug fix

• [x] new features

• [ ] performance

• [ ] docs update

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• [ ] Yes:

• [ ] No

• Other information: Display Blocks :

• Add load_by_default config

• Add selector and type config

Use Generic to_dict / dict_to_object Don't use pointers in workflow to_dict generation

[GhislainJ]

TODO : Should add test for method type default values