Token implementation

[vminkov]

Description

TOUCH token implementation based on solmate's ERC20 with permit() , memo transfers and vesting timelocks.
Some hardhat tasks are also present for ease of deploying the vestings multiple times with different params.

Notion task doc: https://spiky-enemy-a6e.notion.site/TOUCH-Token-Implementation-aa2b956c3d0345c2b3dfca8c43b3dc21

Refinement needed:

• start date of the vesting - set by the owner as the day that the token becomes liquid (gets listed on a DEX)
• what tokens should be minted initially - team tokens, advisor tokens, investor tokens, community/rewards tokens, liquidity mining, etc
• token name and symbol
• vesting schedules
• launch chain
• should it be upgradable? (not upgradeable yet)

@domfromhell : there is no point to deploy it before the system has gauges

Fixes #237

[rhlsthrm]

Need to finalize name but it won't be TOUCH.