Support customized accessor to token whitelist

[shiatcb]

Fixes # .

Motivation

Allow customized token whitelist accessor function to be defined in rosetta-xxx repo.

Solution

See PR

Open questions

[cb-heimdall]

✅ Heimdall Review Status

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[shiatcb]

All other changes are just auto-format except this Setup Python workflow. We need to downgrade to 3.9 to avoid the error when importing web3 library: ethereum/web3.py#2704 (comment)

[jingweicb]

LGTM,
one q: how did it test?
especially tests on backward compatibility

[shiatcb]

LGTM, one q: how did it test? especially tests on backward compatibility

@jingweicb
it's using current unit test to test backward compatibility
The function I modified is called in block_service_test.go via .Block(...)
It checks if the new variable (TokenWhitelistAccessor) is nil, by default it's not defined so it will execute the existing logic