Issue:
[FEATURE]: [Worldline] Currency Unit Conversion

### :memo: Feature Description

- Each currency can be described in terms of base or minor units. 
- For instance, when dealing with USD currency, the Cent is considered as the minor unit, while the Dollar is considered the base unit. 
- In Hyperswitch, the amount value is expected to be always provided in minor units. 
- For example: In USD, If the amount is 1 in base unit (Dollar), then it will be equivalent to 100 in minor units (Cent)
- Some of the connectors integrated require the amount to be converted to a desirable unit before being passed to them. 
- We have functions `to_currency_base_unit` and `to_currency_lower_unit` in place to convert the minor unit amount to its decimal equivalent and vice versa. These conversions are handled explicitly based on the connector.


### :hammer: Possible Implementation

- ConnectorCommon trait have been implemented for the connector. 
- This trait contains `get_currency_unit` method. This method needs to be implemented. 
- It will define what type of conversion needs to be done during `connector_router_data` creation. Concurrently handle the creation of `connector_router_data` to be passed for the connector request body creation.
- You can check this PR for further reference https://github.com/juspay/hyperswitch/pull/2196

:bookmark: Note: All the changes needed should be contained within `hyperswitch/crates/router/src/connector/`

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

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

### :package: Have you read the Contributing Guidelines?

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

### :sparkles: Are you willing to submit a PR?


Resolution:
<think>
PR Context:
- Title: refactor(connector): [Worldline] Currency Unit Conversion
- Merged: 2023-10-13T10:22:23Z
- Files changed: 2 files
- Commits: 3 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [x] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
This pull request implements the get_currency_unit from the ConnectorCommon trait for the Worldline connector. This function allows connectors to declare their accepted currency unit as either Base or Minor. For Worldline  it accepts currency as Minor units.

### Additional Changes
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** refactor(connector): [Worldline] Currency Unit Conversion (#2569)
Files to modify:


**crates/router/src/connector/worldline.rs**
  Add:
    - function: private::get_currency_unit

**crates/router/src/connector/worldline/transformers.rs**
  Add:
    - function: private::try_from
    - struct: pub::WorldlineRouterData
    - impl: impl TryFrom<(
        &types::api::CurrencyUnit,
        types::storage::enums::Currency,
        i64,
        T,
    )> for WorldlineRouterData<T>