code-gen: support for digits in namePart type/pattern

[tjonger]

Most external API's have some version number in the endpoints paths. Since v197 of compas the namePart is sticker, which good I think. But when compas uses the extendWithOpenApi method (see below) to convert an openapi stucture to a compas one, most route paths are used as route names (in compas). This results in validation errors on openapi imported routes.

const app = new App();
app.extendWithOpenApi("group", data);

Example:

Source https://github.com/compasjs/compas/blob/main/gen/code-gen.js#L13

Peposed regex: ^[a-zA-Z][a-zA-Z0-9]+$
Can contain digits but can not start with one