CLI for config operations

[bswck]

Use case

[config.yml]

foo:  # a comment
  bar: 5
  biz:
    baz: 10

> configzen foo.bar  # automatically detect it's about config.yml`
5

> configzen foo.bar=6  # set foo.bar to 6, preserve comments`
[config.yml] Set foo.bar to 6

Example usage

No response

Additional context

No response