feat(connector): add template code for stripebilling

[NISHANTH1221]

Type of Change

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

Description

connector integration template code for stripe billing.

Issue: This PR closes the issue #7212

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?

No testing required since its a template code

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  

Changed Files

File	Status
crates/hyperswitch_connectors/src/connectors.rs	87% smaller
crates/router/src/connector.rs	87% smaller
crates/router/src/core/payments/connector_integration_v2_impls.rs	2% smaller
crates/router/src/core/payments/flows.rs	2% smaller
crates/hyperswitch_connectors/src/default_implementations.rs	2% smaller
crates/hyperswitch_connectors/src/default_implementations_v2.rs	2% smaller
config/config.example.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
config/development.toml	Unsupported file format
config/docker_compose.toml	Unsupported file format
crates/common_enums/src/connector_enums.rs	0% smaller
crates/hyperswitch_connectors/src/connectors/stripebilling.rs	0% smaller
crates/hyperswitch_connectors/src/connectors/stripebilling/transformers.rs	0% smaller
crates/hyperswitch_interfaces/src/configs.rs	0% smaller
crates/router/src/types/api.rs	0% smaller
crates/router/src/types/transformers.rs	0% smaller
crates/router/tests/connectors/main.rs	0% smaller
crates/router/tests/connectors/sample_auth.toml	Unsupported file format
crates/router/tests/connectors/stripebilling.rs	0% smaller
crates/test_utils/src/connector_auth.rs	0% smaller
loadtest/config/development.toml	Unsupported file format
scripts/add_connector.sh	Unsupported file format