feat: Add address reputation

[alex-stone]

What changed? Why?

This adds support for fetching an address' reputation lazily.

Example:

risky_address = Coinbase::ExternalAddress.new(:ethereum_mainnet, '0x12846c6Fd6baBFE4bC6F761eB871eFfFDEb26913')

# Returns the reputation of the address
risky_address.reputation
=> Coinbase::AddressReputation{score: '-90', total_transactions: '0', unique_days_active: '0', longest_active_streak: '0', current_active_streak: '0', activity_period_days: '0', token_swaps_performed: '0', bridge_transactions_performed: '0', lend_borrow_stake_transactions: '0', ens_contract_interactions: '0', smart_contract_deployments: '0'}

# Returns whether the address itself is deemed "risky"
risky_address.risky?
=> true

Qualified Impact

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

The base branch was changed.