Add unsafeFastParseUnits, prefer map.get over array.find

[danielmkm]

Refactor pass to squeeze as many ms outta this thing as possible.

• Add unsafeFastParseUnits, removing parseUnits call in TokenAmount.fromHumanAmount, pretty significant reduction in pool parsing time, seeing consistent times under 10ms now, from 20ms+.
• Refactor the pool entities, removing array.find and array.findIndex calls, preferring the more performant map.get.
• Added stricter modifiers to pool entity props

[mikemcdonald]

Nice! Are you using any profiling tools/setup? Or just console time?

[danielmkm]

Just console time, but would be good to get something better setup for sure.