test: Tick: Call library directly instead of test contract.

The test contract was a middle layer between library and was used by
javascript / HardHat tests. Due to the middle layer using Foundry,
gas cost usage was calculated incorrectly.

Generate correct gas snapshots using direct library calls.
Delete unnecessary comments.

Functions moved and internalized from TickTest.sol:

* ticks()
* tickSpacingToMaxLiquidityPerTick()
* setTick(),
* getFeeGrowthInside()
* update()
* clear()

Ref: #315