Bug: [CHORE] Add file storage config in env_specific toml 



### Feature Description

Add file storage config in env_specific.toml

### Possible Implementation

Add file storage config in env_specific.toml

### Have you spent some time checking if this feature request has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!
diff --git a/config/deployments/env_specific.toml b/config/deployments/env_specific.toml
index 354c320e8f5..04831376050 100644
--- a/config/deployments/env_specific.toml
+++ b/config/deployments/env_specific.toml
@@ -70,9 +70,13 @@ api_logs_topic = "topic"              # Kafka topic to be used for incoming api
 connector_logs_topic = "topic"        # Kafka topic to be used for connector api events
 outgoing_webhook_logs_topic = "topic" # Kafka topic to be used for outgoing webhook events
 
-[file_upload_config]
-bucket_name = "bucket"
-region = "bucket_region"
+# File storage configuration
+[file_storage]
+file_storage_backend = "aws_s3" # File storage backend to be used
+
+[file_storage.aws_s3]
+region = "bucket_region" # The AWS region used by AWS S3 for file storage
+bucket_name = "bucket"   # The AWS S3 bucket name for file storage
 
 # This section provides configs for currency conversion api
 [forex_api]

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [x] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This PR adds file storage config in `env_specific.toml`

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

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1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
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## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
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Cannot be tested as this is just a config addition

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable
