feat(router): add db interface for /relay

[ShankarSinghC]

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

[semanticdiff-com]

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Changed Files

File	Status
crates/diesel_models/src/enums.rs	57% smaller
crates/router/src/routes/routing.rs	23% smaller
crates/openapi/src/openapi.rs	8% smaller
crates/openapi/src/routes/routing.rs	6% smaller
api-reference/openapi_spec.json	0% smaller
config/deployments/env_specific.toml	Unsupported file format
config/deployments/integration_test.toml	Unsupported file format
config/deployments/production.toml	Unsupported file format
config/deployments/sandbox.toml	Unsupported file format
crates/common_enums/src/enums.rs	0% smaller
crates/diesel_models/src/lib.rs	0% smaller
crates/diesel_models/src/query.rs	0% smaller
crates/diesel_models/src/query/relay.rs	0% smaller
crates/diesel_models/src/relay.rs	0% smaller
crates/diesel_models/src/schema.rs	0% smaller
crates/router/src/db.rs	0% smaller
crates/router/src/db/relay.rs	0% smaller
migrations/2024-12-17-141811_add_relay_table/down.sql	Unsupported file format
migrations/2024-12-17-141811_add_relay_table/up.sql	Unsupported file format