Retry core library

[viniarck]

Retrying is a common functionality that NApps requires, for instance when handling IO errors like database failures or requests, just so NApps don't have to reimplement or keep installing other retry libraries. We've got this mapped on two NApps:

• Auto retry potential DB transient failures with tenacity topology#83
• Start to use tenacity lib for retry attempts of_lldp#30

I'd say we should go with tenacity it's a very battle tested library in the Python ecosystem, its reliable to use in production. If you have any other suggestions or concerns let me know.