Add ability to set keys on the global blackboard

[veerajsk]

• The master plan can specify if its keys are meant for the global blackboard using the inherit_blackboard flag in the .plc file. If true, the keys are populated to the global blackboard & the master plan simply inherits the global blackboard as its own. If false, the behaviour remains unchanged.
• Blackboard keys can now have default values

Design doc: https://gajanrapyutarobotics-my.sharepoint.com/:w:/g/personal/veeraj_khokale_rapyuta-robotics_com/EfxYaETn7ItNr5jGGRg4zjIBnXgWhDRmn5XFEhSS6Zr4EA?e=vkbIfr

• Add unit test
• Alica tests pass
• Supplementary tests pass
• Check turtlesim
• Add support for default values
• Add unit test for default values by regenerating etc folders using the new frontend

[bjoernschroeder]

partial review, will continue tomorrow

[bjoernschroeder]

nit: std::int64_t

[bjoernschroeder]

PR is looking good to me so far. It would be great to have tests with different types defined in the global blackboard and using default values when the type is std::any.

[veerajsk]

PR is looking good to me so far. It would be great to have tests with different types defined in the global blackboard and using default values when the type is std::any.

we can't have default values for std::any because we won't be able to parse it without knowing the type

Now that the frontend & backend work, I have setup a default key in testGlobalBlackbordMaster.pml & the unit test basically tests that global blackboard work as expected. I don't think we need a test for each type because the code is essentially the same as for value mapping & we already have many tests for that.