Issue:
[FIX] batch encrypt decrypt for mca fetch/insert/update

This adds batch encryption/decryption support for fetch/insert/update of the Merchant Connector Account.

Resolution:
<think>
PR Context:
- Title: fix: batch encrypt/decrypt on merchant connector account
- Merged: 2024-10-04T13:50:35Z
- Files changed: 3 files
- Commits: 3 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->
- [x] Enhancement

## Description
<!-- Describe your changes in detail -->
This adds batch encrypt/decrypt support for Merchant Connector account create/fetch/update

## 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 (
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix: batch encrypt/decrypt on merchant connector account (#6206)
Files to modify:


**crates/hyperswitch_domain_models/src/merchant_connector_account.rs**
  Add:
    - function: private::from_encryptable
    - function: private::to_encryptable
    - function: private::from_encryptable
    - function: private::to_encryptable
    - function: private::from_encryptable
    - function: private::to_encryptable
    - struct: pub::McaFromRequestfromUpdate
    - struct: pub::McaFromRequest
    - struct: pub::DecryptedMca
    - struct: pub::EncryptedMca
    - struct: pub::DecryptedUpdateMca
    - impl: impl ToEncryptable<DecryptedMca, Secret<serde_json::Value>, Encryption> for EncryptedMca
    - impl: impl ToEncryptable<DecryptedUpdateMca, Secret<serde_json::Value>, Secret<serde_json::Value>> for McaFromRequestfromUpdate
    - impl: impl ToEncryptable<DecryptedMca, Secret<serde_json::Value>, Secret<serde_json::Value>> for McaFromRequest

**crates/router/src/core/admin.rs**
  Modify existing code

**crates/router/src/core/payments/helpers.rs**
  Modify existing code