feat!: use c12 loader configuration

[KeJunMao]

Description

Configuration is loaded by unjs/c12 from cwd. We can use either bump.config.json, bump.config.{ts,js,mjs,cjs}, .bumprc.

Linked Issues

Additional context

I have a need to realize

• Automatic bump
• Changelog generation
• Build project
• Compact dist to zip
• console a log of this change

Now, I use a series of scripts to implement, and I can't get the next version number and the previous version number in preversion or postversion

eg:

    "changelog": "changelogen --output > node_modules/.CHANGELOG",
    "zip": "zzip --name=format:dist-%cd.%tag ",
    "cat": "cat node_modules/.CHANGELOG",
    "preversion": "pnpm changelog",
    "release": "bumpp --all",
    "postversion": "pnpm build && pnpm zip && pnpm cat"

If we can loader configuration file, things will be much easier

谢谢你，偶像:)

[so1ve]

@antfu Sorry for disturbing and commenting in the wrong place... But can you enable issues on this repo? It seemed that issues are not enabled in fork repos by default.