Extend triggers with fee grant support

[iramiller]

Summary

Extend the trigger module with support for reoccurring triggers (requiring a feegrant, defined gas limit, and reoccurrence limits).

Problem Definition

Sometimes a use case would like to have reoccurring events that a trigger would be cumbersome to use because it only fires one time. In addition the combination of the gas/fee paid upfront can be limiting.

Proposal

Add "reoccurring trigger" support that allows a request to be dispatched more than one time subject to a gas limit and feepayer funds.

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[iramiller]

I am not completely convinced we need/want this, I am adding this issue for tracking/discussion.