Add marker comments when generating code

[seanf]

It would be good if kysely-codegen could add a marker comment at the top of the file when generating code. For instance:

// This file was generated automatically by kysely-codegen.
// Please do not edit it by hand.

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[clemmy]

This would be nice as a part of the library.

My hack for this currently is:

kysely-codegen --out-file src/db/types.d.ts && printf \"// This is an auto-generated file. Do not edit it directly.\n// See 'Generating DB schema types for Kysely' in README.\n\n$(cat src/db/types.d.ts)\" > src/db/types.d.ts

[RobinBlomberg]

Should be released in kysely-codegen@0.16.0! 🚀