feat: add 0g executor contract

[connorstake]

Summary by CodeRabbit

• New Features
  • Added ZeroGravity chain support to executor address configuration, expanding available chain compatibility for mainnet deployments.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds a single new blockchain address mapping for the ZeroGravity chain to the Mainnet configuration within the nttManagerWithExecutorAddresses object, expanding the executor address registry by one entry.

Changes

Cohort / File(s)	Summary
Executor Configuration evm/ts/src/nttWithExecutor.ts	Added ZeroGravity chain address mapping (0xA8CA118f4C8d44Ab651Dad52B5E1a212e5d5c55b) to Mainnet nttManagerWithExecutorAddresses registry

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Hops with glee across the chain so bright,
ZeroGravity joins our registry tonight,
One line of config, simple and sweet,
Our executor addresses now more complete! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a ZeroGravity executor contract address to the configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@evm/ts/src/nttWithExecutor.ts`:
- Line 72: The ZeroGravity entry ("ZeroGravity":
"0xA8CA118f4C8d44Ab651Dad52B5E1a212e5d5c55b") in the Testnet executor mapping
should be removed or gated: locate the executor mapping in nttWithExecutor.ts
where the Testnet object contains the ZeroGravity key and either delete that
key/value pair or replace it with a validated Wormhole-supported chain entry; if
you intend to keep it, add a runtime check that verifies the chain is listed in
Wormhole’s supported EVM chains before using the address (fail fast with a clear
error referencing ZeroGravity) to avoid runtime failures.