chore: start adding new transak listing

[ChefBingbong]

---

PR-Codex overview

The focus of this PR is to add support for the opBNB chain and related tokens.

Detailed summary

• Added opBnbTokens import
• Updated network display and full names for OPBNB
• Added OPBNB to various network ID maps
• Included OPBNB in onRampCurrencies and onRampCurrenciesMap

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}