Create the specification of core functions

[juliandsg0222]

Description

This PR solves the issue #256. The changes made were:

• Added the ManagerHistory class structure, which will handle the core actions.
• Made use of the ManagerHistory class in the main file.
• Updated the import of jsondiffpatch library.
• Added the jsonDiffInstance class attribute to create a custom instance of jsondiffpatch library.
• Updated calls of diff, unpatch, and patch methods to use the jsonDiffInstance class attribute.
• Updated the test file to mock the create method from jsondiffpatch library.
• Updated the bundle file.