Create junoswap-liquidity-helper contract

[apollo-sturdy]

Helper contract to balance assets and then provide liquidity. Likely the same logic as the astroport-liquidity-helper contract but needs to be confirmed.

DoD:

• Confirm that the same logic can be used as in the astroport helper.
• If so, change astroport-liquidity-helper to be generic, i.e. take in a P: Pool generic instead of AstroportPool, and compile a version for Junoswap
• If not, make a new junoswap-liquidity-helper contract.