Having the ability to tune logs

[pierresouchay]

We are using this service in my company for several frontends.

There are several problems in case of multi-tenancy:

• logs-groups don't have tags (an issue with invoicing)
• it is hard to find logs, because all IDs are random for both lambdas and logs => make it impossible to find the correct logs easily for an application
• not possible to set retention time for logs or additional parameters

I propose here a PR with small modification to enable this: #254 => should allow running that efficiently and have a common prefix to quickly identity the logs for an app and allow some tuning (retention logs) as well as applying tags on logs

[ottokruse]

We merged #254 and I don't think we can do anything else (see discussion in that PR)