Add trigger.rs for Nango action trigger API

[devin-ai-integration]

Add trigger.rs for Nango action trigger API

Summary

Adds a new trigger.rs module to crates/nango implementing the POST /action/trigger Nango API endpoint.

Two methods on NangoClient:

• trigger_action — synchronous trigger, returns serde_json::Value
• trigger_action_async — sets X-Async: true header, accepts optional max_retries (maps to X-Max-Retries), returns typed TriggerActionAsyncResponse { status_url, id }

Follows existing crate conventions (common_derives! macro, parse_response, header-based connection/provider params).

Review & Testing Checklist for Human

• Verify this compiles — cargo check -p nango failed in CI-like env due to unrelated missing workspace member (plugins/cli2), so the new code was never actually compiled. This is the highest-priority item.
• Confirm the sync return type (serde_json::Value) is the desired ergonomic choice vs. a generic T: DeserializeOwned parameter
• Verify header names (Connection-Id, Provider-Config-Key, X-Async, X-Max-Retries) match the actual Nango API expectations

Notes

• Requested by: @yujonglee
• Devin run

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional findings.