Fix: celo-specific transaction (CIP64) regressions

[nicolasbrugneaux]

This PR aims to fix the issues reported by @0xarthurxyz in celo-org/txtypes#1

This refactors the different checks for CIP42 and CIP64 by using more robust mechanism than truthy/falsy values.
It also removes the tests that added type: 'cipxyz' unnecessarily and by doing so forcing the tx to be correct even though the transaction-type inference not detect it as such. (eg: a cip42 without gatewayFee).

It also refactors some of the tests that checked for a hardcoded raw serialized string (keeps it in a couple place for sanity) but uses the parser to self-check itself.

[Regressions Introduced via #1379]

[Closes celo-org/txtypes/issues/1]

[Original PR celo-org/pull/6]

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PR-Codex overview

This PR focuses on fixing an issue where Celo CIP64 transactions were being recognized as EIP1559 transactions.

Detailed summary

• Fix issue with Celo CIP64 transactions being recognized as EIP1559 transactions
• Import isCIP42 and isCIP64 functions in formatters.ts
• Update formattersCelo object in formatters.ts to use isCIP42 and isCIP64 functions
• Update CeloTransactionSerializableBase type in types.ts
• Import isCIP42

The following files were skipped due to too many changes: src/chains/celo/serializers.ts, src/chains/celo/utils.test.ts, src/chains/celo/serializers.test.ts

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Latest commit: cd13cde

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