feat: improve DX of the CI (#317)

Modernizes the CLI UX, error handling, and generator outputs.

> - **Logging/CLI UX**: New `Logger` with levels, colors, spinners, and JSON mode; shared `BaseCommand` adds flags (`-v`, `-q`, `--silent`, `--json`, `--no-color`, `--debug`). `generate`, `init`, and `telemetry` adopt spinners, verbose/debug output, and JSON results.
> - **Structured errors**: Introduces `CodegenError` with many specific creators; replaces generic throws across parsers, generators, and renderer for clearer, colorized messages.
> - **Generator results**: Generators and renderer now return `GenerationResult`/`GeneratorResult`, tracking `filesWritten` and timings; TypeScript generators (payloads/parameters/headers/types/channels/client/models) propagate file tracking.
> - **Parsing/validation**: AsyncAPI/OpenAPI/JSON Schema loaders emit detailed errors and verbose logs; config processing logs downgraded (debug/verbose) and error creators used.
> - **Tests**: Add comprehensive unit tests for logging, errors, renderer, and JSON Schema parser; update expectations for new error messages.
> - **Deps**: Add `picocolors`.

Author: jonaslagoni

package-lock.json

@@ -20,6 +20,7 @@
     "@oclif/plugin-version": "^2.0.17",
     "@readme/openapi-parser": "^5.0.1",
     "chokidar": "^4.0.3",
+    "picocolors": "^1.1.1",
     "cosmiconfig": "^9.0.0",
     "graphology": "^0.26.0",
     "inquirer": "^8.2.6",