Add @ActionsGroup and @Action support

[SaifJerbi]

Description

[Description of the issue]
Actions behaves the same as fieldset, but can only handle buttons and submits as children.
button and submit can have a onClick attribute that either a function or a string with an angular expression, as with ng-click. The expression is evaluated in the parent scope of the sf-schema directive.

Steps to Reproduce

1. add new annotation

Expected behavior: Render actions

Actual behavior: Not yet implemented

Versions

1.0.0-alpha