feat(xo-cli/rest): dot syntax for deep properties

`foo.bar=baz` can be used instead of `foo=json:'{ "bar": "baz" }'`.

CHANGELOG.unreleased.md

@@ -27,4 +27,6 @@
 
 <!--packages-start-->
 
+- xo-cli minor
+
 <!--packages-end-->

packages/xo-cli/rest.mjs

@@ -8,6 +8,7 @@ import { readChunk } from '@vates/read-chunk'
 import getopts from 'getopts'
 import hrp from 'http-request-plus'
 import merge from 'lodash/merge.js'
+import set from 'lodash/set.js'
 import split2 from 'split2'
 
 import * as config from './config.mjs'
@@ -29,10 +30,10 @@ function parseParams(args) {
   for (const arg of args) {
     const i = arg.indexOf('=')
     if (i === -1) {
-      params[arg] = ''
+      set(params, arg, '')
     } else {
       const value = arg.slice(i + 1)
-      params[arg.slice(0, i)] = value.startsWith('json:') ? JSON.parse(value.slice(5)) : value
+      set(params, arg.slice(0, i), value.startsWith('json:') ? JSON.parse(value.slice(5)) : value)
     }
   }
   return params