feat(analytics): implement currency conversion to power multi-currency aggregation

[maverox]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• implemented currency_conversion for calculating values of amount related metrics from their currency (i.e INR) to
  USD and store it in a separate field variant I created <fieldname>_in_usd
• Implemented a total_amount_in_usd variant for all the total fields related to amounts in query Metadata

Fixes #6416

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

The total amount calculated for all payment analytics buckets related to amounts is incorrect because currency conversion is not being applied before summing the values. As a result, amounts in different currencies are being added together, leading to an inaccurate total.

How did you test it?

curl --location 'http://localhost:8080/analytics/v1/org/metrics/payments' \
--header 'Accept: */*' \
--header 'Accept-Language: en-GB,en-US;q=0.9,en;q=0.8' \
--header 'Connection: keep-alive' \
--header 'Content-Type: application/json' \
--header 'Origin: http://localhost:9000' \
--header 'QueryType: SingleStat' \
--header 'Referer: http://localhost:9000/' \
--header 'Sec-Fetch-Dest: empty' \
--header 'Sec-Fetch-Mode: cors' \
--header 'Sec-Fetch-Site: same-site' \
--header 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36' \
--header 'api-key: dev_r3kVZ4URj3fMiHhJJuhHOVqteaXwKyEMGCaFo6PiCS6S9vZsb0ErV4kCVqogM60H' \
--header 'authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoiMDZlOGRmZWYtMzI0Zi00Yjc0LTg2MTItYzdkZjNhOGZmZTcyIiwibWVyY2hhbnRfaWQiOiJtZXJjaGFudF8xNzI3NDM0NTkzIiwicm9sZV9pZCI6Im9yZ19hZG1pbiIsImV4cCI6MTcyOTgzNzUwNywib3JnX2lkIjoib3JnXzl3Y0kxQ2hTOGVEdnRRQmRXak9IIiwicHJvZmlsZV9pZCI6InByb19FNW5lek43YjZUbVB1WlUzbEU1VSJ9.KlBRpu8DpGZ43u9hsB4xE2oSXNM21HC0RadRdfMe2VI' \
--header 'sec-ch-ua: "Chromium";v="130", "Google Chrome";v="130", "Not?A_Brand";v="99"' \
--header 'sec-ch-ua-mobile: ?0' \
--header 'sec-ch-ua-platform: "macOS"' \
--data '[
    {
        "timeRange": {
            "startTime": "2024-10-13T18:30:00Z",
            "endTime": "2024-10-21T12:54:00Z"
        },
        "mode": "ORDER",
        "source": "BATCH",
        "metrics": [
            
            
            
            
            "payment_processed_amount"
        ],
        "delta": true
    }
]'

Checklist

• 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

[semanticdiff-com]

Review changes with SemanticDiff.

Analyzed 16 of 18 files.

Overall, the semantic diff is 18% smaller than the GitHub diff.

	Filename	Status
❔	Cargo.lock	Unsupported file format
✔️	crates/router/src/analytics.rs	69.16% smaller
✔️	crates/router/src/utils/currency.rs	25.0% smaller
✔️	crates/router/src/core/currency.rs	Analyzed
✔️	crates/api_models/src/analytics.rs	Analyzed
✔️	crates/api_models/src/analytics/payment_intents.rs	Analyzed
✔️	crates/api_models/src/analytics/payments.rs	Analyzed
❔	crates/analytics/Cargo.toml	Unsupported file format
✔️	crates/analytics/src/errors.rs	Analyzed
✔️	crates/analytics/src/payments/accumulator.rs	46.67% smaller
✔️	crates/analytics/src/payments/core.rs	0.06% smaller
✔️	crates/analytics/src/payments/metrics/payment_processed_amount.rs	Analyzed
✔️	crates/analytics/src/payments/metrics/sessionized_metrics/payment_processed_amount.rs	Analyzed
✔️	crates/analytics/src/payment_intents/accumulator.rs	50.76% smaller
✔️	crates/analytics/src/payment_intents/core.rs	2.75% smaller
✔️	crates/analytics/src/payment_intents/metrics/smart_retried_amount.rs	Analyzed
✔️	crates/analytics/src/payment_intents/metrics/sessionized_metrics/payment_processed_amount.rs	Analyzed
✔️	crates/analytics/src/payment_intents/metrics/sessionized_metrics/smart_retried_amount.rs	Analyzed