feat: added opBNB support

[HimanshuS2212]

Ticket: COIN-6014

TICKET: COIN-6014

[mullapudipruthvik]

@claude review this pr as grug. Only focus on bugs and issues, I do not care about things that are done well, exclude these from your output. Limit your output to 500 words or less

[Copilot]

Pull request overview

This PR adds support for opBNB, a Layer 2 blockchain built on the OP Stack (Optimism infrastructure) and maintained by BNB Chain. The implementation follows the pattern used for other Ethereum-compatible chains by adding the necessary coin family definitions, network configurations, environment settings, and factory registrations for both mainnet ('opbnb') and testnet ('topbnb').

Key changes:

• Added opBNB to the CoinFamily and UnderlyingAsset enums
• Created OpBNB and OpBNBTestnet network class definitions with appropriate chain IDs (204 for mainnet, 5611 for testnet)
• Registered opBNB coins in the factory as EthLikeCoin instances with corresponding test fixtures

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
modules/statics/src/base.ts	Added OPBNB to CoinFamily and UnderlyingAsset enums
modules/statics/src/networks.ts	Defined OpBNB and OpBNBTestnet network classes with explorer URLs and chain IDs, exported in Networks object
modules/statics/src/allCoinsAndTokens.ts	Created coin definitions for topbnb (testnet) and opbnb (mainnet) with features and network references
modules/sdk-core/src/bitgo/environments.ts	Added environment configurations for opbnb and topbnb with API baseUrl and token settings
modules/bitgo/src/v2/coinFactory.ts	Registered opbnb/topbnb in coin factory and token constructor mappings
modules/statics/test/unit/fixtures/expectedColdFeatures.ts	Added opbnb and topbnb to the 'neither' category (no TSS or multisig support)
modules/sdk-coin-ethlike/test/unit/ethlikeCoin.ts	Added topbnb to the test suite for EthLikeCoin functionality
modules/sdk-coin-ethlike/test/fixtures/ethlikeCoin.ts	Added test fixtures including transaction hex and custodial hot wallet signature data for topbnb

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