Implement ChangeLogging for generic events in MrMap

[jokiefer]

Environment

• Python version: 3.7+
• MrMap version: 1.0-pre

Proposed Functionality

On different events such as service registered, service deleted, metadata updated, metadata added, etc. the user shall be able to see a change log in the gui. Take a look at the netbox project again. There is a simple ChangeLog implemented.

Use Case

• user wants to know what becomes changed

Database Changes

• new model to store changes.

External Dependencies

none

[jokiefer]

See the model mixin also:
https://github.com/netbox-community/netbox/blob/dd0489c1c50b0709fc603e40261f144665338032/netbox/netbox/models.py#L28

[jokiefer]

see also other 3th-party django app https://django-reversion.readthedocs.io/en/stable/api.html

[jokiefer]

see also other 3th-party django app https://django-simple-history.readthedocs.io/en/latest/querying_history.html