Allow relaying of all ERC-20 methods

[iamacook]

Summary

This facilitates the relaying of all ERC-20 methods, with validation of transfer and transferFrom methods:

• transfer transactions that are being executed to 'self' (the Safe) cannot be relayed.
• transferFrom transactions that are being executed to 'self' or transferring from the sender to receiver cannot be relayed.

Motivation

We were previous only allowing "valid" transfer relays. It was otherwise not possible to relay other methods.

This is an inherent bug that was ported over from the relay service - it was only validating transfer calldata. Other methods were able to relay as they passed the 'self'-validation.

Note: although there is no validation of transferFrom on the relay service, adding it aligns with that of transfer.

Changes

• Add validation of transferFrom relays
• Allow relay of other methods of ERC-20
• Add respective IEncoders for mocking calldata
• Add test coverage

[coveralls]

Pull Request Test Coverage Report for Build 8277263145

Details

• 35 of 37 (94.59%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 93.378%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/domain/relay/limit-addresses.mapper.ts	27	29	93.1%

Files with Coverage Reduction	New Missed Lines	%
src/domain/relay/limit-addresses.mapper.ts	1	90.52%

Totals
Change from base Build 8248254267:	-0.02%
Covered Lines:	6377
Relevant Lines:	6595

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💛 - Coveralls

[fmrsabino]

👏 🚀