fix(cli): add start-or-reload kebab-case alias

[Hashim1999164]

Summary

• Prefer start-or-reload as the CLI command name so it matches other kebab-style PM2 commands.
• Keep startOrReload as an alias so existing scripts and docs keep working.

Fixes #6107

Test plan

• pm2 start-or-reload ecosystem.config.js runs the same path as before
• pm2 startOrReload ecosystem.config.js still works via the alias
• pm2 --help lists start-or-reload

[CLAassistant]

All committers have signed the CLA.

[goransh-walia]

This looks good to me at a glance — thanks for putting it together.