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/casterconfig into main will be

90.73%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src/token-voting
LlamaTokenActionCreator.sol	96%	83.33%	100%	100%	131–132, 271
LlamaTokenCaster.sol	85.59%	85.14%	84%	86.13%	213–214, 409, 414, 414, 414–416, 416, 416–420, 422, 440, 449, 449, 449–451, 451, 451–455, 457, 546–547
LlamaTokenVotingFactory.sol	85%	50%	100%	100%	94–96
src/token-voting/token-adapters
LlamaTokenAdapterVotesTimestamp.sol	95.65%	50%	100%	100%	71