zombie interest gov fee

[jrhea]

This PR adds a configurable zombie interest governance fee and renames the old governanceFee variable to governanceLPFee.

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: 51f0d18	Previous: 51a4ea6	Deviation	Status
addLiquidity: min	1600 gas	1600 gas	0%	🟰
addLiquidity: avg	53759 gas	53699 gas	0.1117%	🚨
addLiquidity: max	99828 gas	99828 gas	0%	🟰
checkpoint: min	1216 gas	1216 gas	0%	🟰
checkpoint: avg	48064 gas	47501 gas	1.1852%	🚨
checkpoint: max	114768 gas	114768 gas	0%	🟰
closeLong: min	1690 gas	1690 gas	0%	🟰
closeLong: avg	27323 gas	26952 gas	1.3765%	🚨
closeLong: max	137971 gas	137971 gas	0%	🟰
closeShort: min	1693 gas	1693 gas	0%	🟰
closeShort: avg	29383 gas	29406 gas	-0.0782%	✅
closeShort: max	110588 gas	110684 gas	-0.0867%	✅
initialize: min	1605 gas	1605 gas	0%	🟰
initialize: avg	181729 gas	181724 gas	0.0028%	🚨
initialize: max	256838 gas	256838 gas	0%	🟰
openLong: min	736 gas	736 gas	0%	🟰
openLong: avg	54470 gas	54437 gas	0.0606%	🚨
openLong: max	179948 gas	179948 gas	0%	🟰
openShort: min	702 gas	702 gas	0%	🟰
openShort: avg	53854 gas	53869 gas	-0.0278%	✅
openShort: max	177871 gas	177871 gas	0%	🟰
redeemWithdrawalShares: min	1598 gas	1598 gas	0%	🟰
redeemWithdrawalShares: avg	21135 gas	20783 gas	1.6937%	🚨
redeemWithdrawalShares: max	51824 gas	51824 gas	0%	🟰
removeLiquidity: min	1661 gas	1661 gas	0%	🟰
removeLiquidity: avg	75662 gas	76001 gas	-0.4460%	✅
removeLiquidity: max	212872 gas	212872 gas	0%	🟰

This comment was automatically generated by workflow using github-action-benchmark.

[coveralls]

coverage: 95.788% (+0.02%) from 95.772%
when pulling 51f0d18 on zombieFee
into 51a4ea6 on main.

[jalextowle]

LGTM, aside from some nits. Nice work!