Wing examples: organize all test files based on the language spec structure

Community Note

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Feature Spec

Wing examples folder is now organized based on the language spec's structure.

Use Cases

We want to make it very easy to understand what is supported and how to use it. This structure should assist both Wing users and contributors

Implementation Notes

This should be easy to do at this point, while we have merely a few examples.
We should also add support for sub-folders under https://github.com/winglang/wing/tree/main/examples/tests/valid and https://github.com/winglang/wing/tree/main/examples/tests/invalid - this can be done in the hangar tool

Component

Contributor Experience

Start by comparing the examples folder with the language spec structure, then inspect examples/tests/valid, examples/tests/invalid, and tools/hangar/src/cli.test.ts. Organize the examples accordingly and add hangar support for subfolders under the valid and invalid test directories; done means the structure is easy to navigate and the hangar tests pass.