[REFACTOR]: [HELCIM] Add amount conversion framework to Helcim

[ImSagnik007]

:memo: Feature Description

Currently, amounts are represented as i64 values throughout the application. We want to introduce a Unit struct that explicitly states the denomination. A new type, MinorUnit, has been added to standardize the flow of amounts across the application. This type will now be used by all the connector flows.

Rather than handling conversions in each connector, we will centralize the conversion logic in one place within the core of the application.

:hammer: Possible Implementation

• For each connector, we need to create an amount conversion function. Connectors will specify the format they require, and the core framework will handle the conversion accordingly.
• Connectors should invoke the convert function to receive the amount in their required format.
• Refer to the connector documentation to determine the required amount format for each connector.
• You can refer this PR for more context.

🔖 Note: All the changes needed should be contained within hyperswitch/crates/router/src/connector/ , crates/router/src/types/api.rs , crates/router/tests/connectors/

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

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

:package: Have you read the Contributing Guidelines?

• [ ] I have read the Contributing Guidelines

:sparkles: Are you willing to submit a PR?

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[mohit07dec]

I’d like to take on this issue. @ImSagnik007 Could you please assign it to me ?

[gorakhnathy7]

Hey @mohit07dec Assigning this issue to you, thanks for participating!

[hex1c]

Hi @gorakhnathy7, if this assignee is no longer working on this issue, feel free to assign it to me and I can take it on.

[gorakhnathy7]

Hey @mohit07dec Are you still working on this!

[mohit07dec]

Yes @gorakhnathy7

[gorakhnathy7]

Hey @mohit07dec If you have any questions or need assistance, feel free to reach out in the community.