new events

[jrhea]

resolves #631

This PR adds new events Specifically,

• checkpoint event

this event fire whenever a new checkpoint is created. it includes info about the checkpoint time, positions that have matured and the lpSharePrice

• CollectGovernanceFee

this event will fire when governance fees are harvested

[coveralls]

coverage: 97.129% (-0.07%) from 97.203% when pulling 75146b4 on new-events into ce83bb4 on main.

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: 75146b4	Previous: 3b0ae37	Deviation	Status
addLiquidity: min	733 gas	733 gas	0%	🟰
addLiquidity: avg	54406 gas	56856 gas	-4.3091%	✅
addLiquidity: max	97572 gas	97520 gas	0.0533%	🚨
checkpoint: min	558 gas	558 gas	0%	🟰
checkpoint: avg	47883 gas	30358 gas	57.7278%	🚨
checkpoint: max	100012 gas	79983 gas	25.0416%	🚨
closeLong: min	755 gas	755 gas	0%	🟰
closeLong: avg	23509 gas	23271 gas	1.0227%	🚨
closeLong: max	114933 gas	105204 gas	9.2477%	🚨
closeShort: min	802 gas	802 gas	0%	🟰
closeShort: avg	24946 gas	24802 gas	0.5806%	🚨
closeShort: max	111483 gas	105555 gas	5.6160%	🚨
initialize: min	662 gas	662 gas	0%	🟰
initialize: avg	177313 gas	161026 gas	10.1145%	🚨
initialize: max	251633 gas	234375 gas	7.3634%	🚨
openLong: min	757 gas	757 gas	0%	🟰
openLong: avg	55701 gas	56098 gas	-0.7077%	✅
openLong: max	216881 gas	225599 gas	-3.8644%	✅
openShort: min	712 gas	712 gas	0%	🟰
openShort: avg	56283 gas	56491 gas	-0.3682%	✅
openShort: max	218170 gas	220880 gas	-1.2269%	✅
removeLiquidity: min	777 gas	777 gas	0%	🟰
removeLiquidity: avg	76463 gas	76757 gas	-0.3830%	✅
removeLiquidity: max	204512 gas	184507 gas	10.8424%	🚨

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

[jalextowle]

LGTM