Add Base Goerli chain ID and addresses to JS SDK

[mdehoog]

Description

Adds the Base Goerli chain ID (84531) to the Javascript SDK. Also adds the Base Goerli contract addresses (mainnet is not yet deployed).

Tests

None added, just adding constants.

Additional context

We are attempting to get fault-detector up and running, and seeing:

Error: cannot get contract AddressManager for unknown L2 chain ID 84531, you must provide an address

TODOs

• Author or reviewer has added an entry to the current release notes draft, if appropriate.

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Latest commit: 7b62702

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