test: by signature tests

[dd0sxx]

Motivation:

• importing over the by signature tests so that the token voting module supports creating/canceling/approving/disapproving actions by signature

Modifications:

• Added the tests over from llama-internal and adjusted them to work in llama-periphery

Result:

We now have tests for all of the by signature methods in the token voting module

[github-actions]

Coverage after merging theo/by-sig-tests into main will be

93.59%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src/token-voting
ERC20TokenholderActionCreator.sol	100%	100%	100%	100%
ERC20TokenholderCaster.sol	100%	100%	100%	100%
ERC721TokenholderActionCreator.sol	0%	100%	0%	0%	27, 31, 35
ERC721TokenholderCaster.sol	0%	100%	0%	0%	24, 28, 32
LlamaTokenVotingFactory.sol	100%	100%	100%	100%
TokenholderActionCreator.sol	92.54%	92.86%	82.35%	97.22%	211–212
TokenholderCaster.sol	93.60%	91.67%	83.33%	96.81%	273–274, 307–308, 355–356, 380–381