Deno support

Is your feature request related to a problem? Please describe.
Currently, most of @redocly/cli works within Deno using the compatibility mode. Though, when using the preview-docs command, it appears that @redocly/cli hangs and does nothing. For example, attempt to invoke with deno run --unstable --allow-all npm:@redocly/cli preview-docs your-openapi-schema.json using any openapi schema as the input. Running the equivalent command with npx would spawn a working live server.

Describe the solution you'd like
Support for running @redocly/cli using Deno as the runtime instead of Node.

Describe alternatives you've considered
I have considered just writing a wrapper that manually invokes deno run -A npm:@redocly/cli build-docs via Deno script and emulates the preview-docs functionality, but would prefer a solution that isn't so involved.

Additional context
Deno is awesome, and it has Node.js API support out of the box. Perhaps this could be a simple code change, without having to import any Deno awareness into the @redocly/cli codebase.

Start by reproducing deno run --unstable --allow-all npm:@redocly/cli preview-docs your-openapi-schema.json and compare it with the working npx invocation. Investigate the preview-docs command and its live-server behavior; done means the command runs successfully under Deno and serves the documentation.