Enhance ComponentTesting.md: Document loadModule and importPath

The ComponentTesting.md guide is missing details on how to load modules dynamically, which is crucial for testing components not included in the initial app bundle.

Requirements:

1. Document the neo.loadModule({ path }) method, including the warning that it relies on dynamic imports (webpack ignored) and is intended for dev/testing only.
2. Document the importPath config option in neo.createComponent(). Explain that this is a shortcut to lazy-load a class before instantiation, avoiding a separate loadModule call.
3. Clarify that both features are primarily for the testing environment.

References:

• src/worker/App.mjs (createNeoInstance and loadModule methods)
• test/playwright/util/RmaHelpers.mjs

Example to Add:

// Shortcut: Load and create in one step
await neo.createComponent({
    className : 'Neo.button.Base',
    importPath: '../../src/button/Base.mjs',
    text      : 'Lazy Loaded Button'
});