Issue:
Deep health check for outgoing request

Resolution:
<think>
PR Context:
- Title: feat: add healthcheck for outgoing request
- Merged: 2024-02-01T11:58:11Z
- Files changed: 5 files
- Commits: 8 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->
- [x] New feature

## Description
<!-- Describe your changes in detail -->
Closes #3518. Add healthcheck for outgoing calls

## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentati
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** feat: add healthcheck for outgoing request (#3519)
Co-authored-by: hyperswitch-bot[bot] <148525504+h
Files to modify:


**crates/api_models/src/health_check.rs**
  Modify existing code

**crates/router/src/consts.rs**
  Modify existing code

**crates/router/src/core/errors.rs**
  Add:
    - enum: pub::HealthCheckOutGoing

**crates/router/src/core/health_check.rs**
  Add:
    - function: private::health_check_outgoing

**crates/router/src/routes/health.rs**
  Modify existing code