implement mongodb methods

[kggold4]

Open a new branch from 1.0.0, called it in the format: 1.0.0-DDMMYY-text...

• for example, if today is 23/01/2023 and I'm adding the logger code, my branch name will be: 1.0.0-230123-adding-logger-code

Implement in mongodb_utils.py the methods:

1. delete_many
2. update_one
3. update_many
4. count
5. exists
6. get_many

• look at the interface to understand what the methods do or ask me if you need
• look how I have implemented the other methods and try to keep it in the same code formats

after done, open a merge request into 1.7.0 and assign me