Feature request: Timer triggered functions

It would be nice if Timer triggered functions would be available.

[x] Azure Timer triggers
[x] Unify timer trigger timestamp (add Zulu identifier to Azure)
[x] Unify cron expression - omit Azure seconds field, replace as 0 when deploying to Azure
[x] Document Azure
[x] AWS Lambdas with Scheduled events
[x] Unify cron expression - omit AWS years field, replace as * when deploying to AWS
[x] Document AWS
[ ] Add timer example into example project

Following fields are common to both AWS and AZURE:

Minutes Hours Day-of-month Month Day-of-week

example:

*/1 * * * * Would create a timer that triggers every minute

Azure Exceptions: Seconds (first field in expression) AWS Exceptions: Year (last field in expression)

Timer handler could be:

(defn handler [timer] ... )

Where timer would be

{:trigger-time "YYYY-MM-DDTHH:MM:SSZ"
 :log <serverless runtime provided logger>}

siilisolutions / hedge