feat: add callerName option to createRsbuild

[chenjiahan]

Summary

This PR adds a new callerName option to createRsbuild to specify the name of the framework or tool that is currently invoking Rsbuild, which can be accessed by Rsbuild plugins through context.callerName, and execute different logic based on this identifier.

This naming is inspired by the caller.name option provided by Babel.

import { myPlugin } from './myPlugin';

const rsbuild = await createRsbuild({
  callerName: 'rslib',
  rsbuildConfig: {
    plugins: [myPlugin],
  },
});

// myPlugin.ts
export const myPlugin = {
  name: 'my-plugin',
  setup(api) {
    const { callerName } = api.context;

    if (callerName === 'rslib') {
      // ...
    } else if (callerName === 'rsbuild') {
      // ...
    }
  },
};

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Timeless0911]

LGTM