feat: add imports option to configure

[timdeschryver]

Allows the configure method to be used to add frequently used modules.
This can be helpful for example setting the forms module at a global level instead of importing the module in every test.

beforeEach(() => {
  configure({
    defaultImports: [ReactiveFormsModule],
  });
});

[timdeschryver]

🎉 This PR is included in version 9.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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