refactor: caster initializes with caster config

[dd0sxx]

Motivation:

closes #68

Modifications:

• created CasterConfig struct
• Pass in the config at initialization time for the caster contracts

Result:

periods can be set at deploy time

[github-actions]

Coverage after merging theo/caster-config into main will be

88.38%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src/token-voting
LlamaERC20TokenActionCreator.sol	87.50%	50%	100%	100%	43–44
LlamaERC20TokenCaster.sol	92.31%	50%	100%	100%	42
LlamaERC721TokenActionCreator.sol	84.21%	50%	100%	100%	43, 45–46
LlamaERC721TokenCaster.sol	87.50%	50%	100%	100%	42, 44
LlamaTokenActionCreator.sol	84.62%	68.18%	85.71%	91.67%	125–126, 271, 271–274, 274, 274, 280–281
LlamaTokenCaster.sol	81.61%	79.27%	78.13%	83.67%	208–209, 402, 407, 407, 407–409, 409, 409–413, 415, 433, 442, 442, 442–444, 444, 444–448, 450, 534–535, 543, 543–546, 546, 546, 552–553, 558–559
LlamaTokenVotingFactory.sol	100%	100%	100%	100%