Add v4 support for specifying retry policy

[ejizba]

This doc was particularly helpful as I was working on this feature: https://learn.microsoft.com/azure/azure-functions/functions-bindings-error-pages

Depends on Azure/azure-functions-nodejs-worker#696

Fixes #73

[gunzip]

Since the retry policies will work only with kafka, timer and eventhub triggers I wonder if there's a way to extend only these specific options (shouldn't we?) in order to avoid to let users specify retry options for triggers where they won't work.

[ejizba]

Hi @gunzip, I've already done that in this PR. I also have it as an option for Cosmos DB, per the docs I mentioned above. That being said, we don't want the Node.js model to be in charge of blocking people for things like this (I'm not sure when the other triggers will stop working), so I also added it to the generic options so that people can workaround us if they want to.

[ejizba]

ping @hossam-nasr