refactor(routing): move dynamic routing related code changes to separate files

[prajjwalkumar17]

Type of Change

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

Description

Additional Changes

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

Motivation and Context

How did you test it?

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

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Changed Files

File	Status
crates/router/src/core/payments/routing.rs	94% smaller
crates/router/src/core/payments.rs	23% smaller
crates/router/src/core.rs	0% smaller
crates/router/src/core/dynamic_routing.rs	0% smaller
crates/router/src/core/dynamic_routing/helpers.rs	0% smaller
crates/router/src/core/payments/operations/payment_response.rs	0% smaller
crates/router/src/core/routing.rs	0% smaller
crates/router/src/core/routing/helpers.rs	0% smaller
crates/router/src/routes/routing.rs	0% smaller