feat: simplifying csml language

[Frnd-me]

Pull Request

Description

Improving the readability of CSML code, bumping the version of CSML to 4.0.0.

Summary of changes:

• Contexts have their names omit the context postfix.
• local data is now named transient data.
• name fields are moved out of constructs and moved to the key of the mapping containing the constructs.
• Various changes in field names, such as iif for guards, do for the actions of a transition, or` instead of the else target state of a transition.
• A context is not a separate construct anymore, but a mapping of variable names and value expressions.
• The keyword local has been removed; invocations now use an invocation mode.
• The assign action has been removed in favor of the eval action.
• The create action has been removed.
• Persistent data can only be declared in the collaborative state machine.
• States can only have static data.
• Match actions now have a default action in case no cases match.

Various other changes, please refer to the test cases.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code style update
• Refactoring
• Build-related changes
• CI-related changes

How has this been tested?

All tests pass.