General Refactor

[TheRustifyer]

✅ Legitimate Performance Improvements (likely contributors):

Singleton Initialization:

• Canyon::init() now runs once and reuses the global instance.

• Previous versions may have re-initialized the configuration and connections on every test (especially if instance() panicked and tests had to restart initialization).

• This new OnceLock approach means fewer file reads, fewer TOML parses, and fewer Runtime::new() calls.

Avoiding Re-parsing the config file:

• We’re no longer scanning directories and reloading/parsing the config in each test.

• This is a huge win if your config file is large or complex.

Connection Caching:

• DatabaseConnection::new() is now called only once per datasource.
• Previously, each test might have created fresh connections or runtimes.

Tokio Runtime Reuse:

• Creating and dropping a Runtime is expensive. Now you’re reusing a single one.