Issue:
refactor(settings): make the function to deserialize hashsets more generic

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This PR updates the application configuration deserialization logic to use a common generic function to deserialize `HashSet<T>` instead of specific ones. In addition, this PR updates the function to be more lenient in that it allows spaces around the commas for better readability.

## Motivation and Context
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Closes #3466.

## 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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Unit tests:
```shell
cargo test --package router --lib --all-features -- configs::settings::hashset_deserialization_test
```

<img width="800" alt="Screenshot of unit tests run" src="https://github.com/juspay/hyperswitch/assets/22217505/ac1de2b4-f771-44c7-87a9-03e62e8904f6">

Also, ran the application with each of the modified config files to verify that the application is able to correctly deserialize the specified config entries.

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Resolution:
<think>
PR Context:
- Title: chore: add missing migrations for recently added currencies
- Merged: 2024-05-24T12:19:21Z
- Files changed: 2 files
- Commits: 1 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This PR adds missing migrations for the new currencies introduced in #3104.

### Additional Changes

- [ ] This PR modifies the API contract
- [x] This PR modifies the database schema
- [ ] This PR modifies application configuration/envi
</think>

To implement this, you'll need to modify:


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