`@std/yaml`: `sortKeys` doesn't take depth into account

[scarf005]

Is your feature request related to a problem? Please describe.

> import * as YAML from "@std/yaml/unstable-stringify"
undefined
> YAML.stringify({ a: 1, b: 2, c: { dd: [1,2,3], ee: 3 } }, { sortKeys: (a, b) => { console.log({a, b}); return a < b }})
{ a: "b", b: "a" }
{ a: "c", b: "b" }
{ a: "ee", b: "dd" }
"a: 1\nb: 2\nc:\n  dd:\n    - 1\n    - 2\n    - 3\n  ee: 3\n"

sortKeys option in YAML.stringify does not take depth into account. this makes sorting only the first depth (for controlling merge conflict) not possible:

const order = new Map([
  ["schema_version", 0],
  ["id", 1],
  ["display_name", 2],
  ["short_description", 3],
  ["author", 4],
  ["license", 5],
  ["version", 6],
  ["homepage", 7],
  ["icon_url", 8],
  ["parent", 9],
  ["source", 10],
  ["dependencies", 11],
  ["categories", 12],
  ["autoupdate", 13],
  ["last_updated", 14],
])

export const stringifyManifest = (manifest: unknown) =>
  YAML.stringify(manifest, {
    quoteStyle: '"',
    sortKeys: (a, b) => {
      const aOrder = order.get(a)
      const bOrder = order.get(b)
      if (aOrder !== undefined && bOrder !== undefined) {
        return aOrder - bOrder
      } else if (aOrder !== undefined) {
        return -1
      } else if (bOrder !== undefined) {
        return 1
      } else {
        return a.localeCompare(b)
      }
    },
  })

Describe the solution you'd like

change signature to also pass depth: sortKeys: (a: string, b: string, depth: number) => number

Describe alternatives you've considered

maybe pass in dot-separated path like foo.bar.baz?