Fix #144: Automatically strip port 3306 from connection strings

[Vishhh03]

Closes #144

I updated the buildURL function in src/index.ts to automatically ignore port 3306 when generating the connection URL if it's found in the config.url.

I also updated the Connection class constructor to strip 3306 directly from config.host if you pass the connection properties separately (e.g., host, username, password), coercing it properly to standard HTTPS (port 443).

I added a couple of test cases in __tests__/index.test.ts to verify that 3306 is properly stripped in both scenarios.