Better support for automation of stacking pools

[friedger]

Is your feature request related to a problem? Please describe. I would like to automate managing a stacking pool (delegation of stacking) as much as possible. Currently, it is not possible

1. to discover if a user delegates to my pool's delegation address. This is needed to initiate the stacking process for a user.
2. to discover the delegated amount of a user in a smart contract. This is needed to stack the user's STX in a managing contract.

Describe the solution you'd like For 1., I would like to see an event when use delegates or revokes stacks For 2., I would like to see a function in pox to read the delegation state or more generally a clarity function to read map from another contract (https://github.com/clarity-lang/reference/issues/30)

Describe alternatives you've considered Currently, I do this off-chain

Additional context [Ultra Mega Super Stacks 2.1 Thread] https://github.com/stacksgov/sips/discussions/16

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