Adds a reentrancy guard

[jalextowle]

Fixes: #427.

Along with adding the reentrancy guard and fully testing that Hyperdrive's core functions cannot be reentered, I did some refactoring of the test framework. After this PR, the methodology used in the test wrappers should be much more consistent, and the Hyperdrive test framework supports ether. Aside from this, I re-did the test wrapper API so that configurations can be overrided more easily and in a more readable format.

[coveralls]

coverage: 96.18% (-0.2%) from 96.372% when pulling d5093d5 on jalextowle/bug/steth-reentrancy into fb74a17 on main.

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: d5093d5	Previous: 5007450	Deviation	Status
addLiquidity: min	785 gas	709 gas	10.7193%	🚨
addLiquidity: avg	43439 gas	45498 gas	-4.5255%	✅
addLiquidity: max	80524 gas	77728 gas	3.5972%	🚨
checkpoint: min	514 gas	514 gas	0%	🟰
checkpoint: avg	23044 gas	23019 gas	0.1086%	🚨
checkpoint: max	33438 gas	33407 gas	0.0928%	🚨
closeLong: min	852 gas	659 gas	29.2868%	🚨
closeLong: avg	45985 gas	47497 gas	-3.1834%	✅
closeLong: max	85978 gas	83240 gas	3.2893%	🚨
closeShort: min	809 gas	616 gas	31.3312%	🚨
closeShort: avg	40932 gas	42330 gas	-3.3026%	✅
closeShort: max	73498 gas	84477 gas	-12.9964%	✅
initialize: min	714 gas	532 gas	34.2105%	🚨
initialize: avg	159493 gas	160281 gas	-0.4916%	✅
initialize: max	233625 gas	161781 gas	44.4082%	🚨
openLong: min	740 gas	661 gas	11.9516%	🚨
openLong: avg	114654 gas	114770 gas	-0.1011%	✅
openLong: max	180018 gas	175911 gas	2.3347%	🚨
openShort: min	782 gas	709 gas	10.2962%	🚨
openShort: avg	149158 gas	159830 gas	-6.6771%	✅
openShort: max	219306 gas	218810 gas	0.2267%	🚨
removeLiquidity: min	762 gas	569 gas	33.9192%	🚨
removeLiquidity: avg	57259 gas	62682 gas	-8.6516%	✅
removeLiquidity: max	119378 gas	116558 gas	2.4194%	🚨

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

[ControlCplusControlV]

Looks good, just some minor comments

[ControlCplusControlV]