feat(cdk:forms): useFormGroup support nested objects

[danranVm]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

const nameGroup = useFormGroup({
  firstName: ['', required],
  lastName: ['', required],
})

const addressGroup = useFormGroup({
  city: ['', required],
  street: ['', required],
  zip: [''],
})

// 不支持直接嵌套 object
const formGroup = useFormGroup({
  name: nameGroup,
  address: addressGroup,
})

// 需要手动声明 string[]
const formArray = useFormArray<string[]>([['', required]])

What is the new behavior?

// 直接嵌套使用
const formGroup = useFormGroup({
  name: {
    firstName: ['', required],
    lastName: ['', required],
  },
  address: {
    city: ['', required],
    street: ['', required],
    zip: [''],
  },
})

// 只需要声明 string 
const formArray1 = useFormArray<string>([['', required]])
// 或者利用反向推导，直接得到对应类型
const formArray2 = useFormArray([['', required]])

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1021 (e8096ef) into main (33b43bb) will decrease coverage by 0.00%.
The diff coverage is 96.25%.

@@            Coverage Diff             @@
##             main    #1021      +/-   ##
==========================================
- Coverage   93.91%   93.91%   -0.01%     
==========================================
  Files         308      308              
  Lines       29355    29386      +31     
  Branches     2531     2534       +3     
==========================================
+ Hits        27568    27597      +29     
- Misses       1787     1789       +2     

Impacted Files	Coverage Δ
packages/components/form/src/FormItem.tsx	97.48% <80.00%> (-1.19%)	⬇️
packages/cdk/forms/src/controls.ts	100.00% <100.00%> (ø)
packages/cdk/forms/src/types.ts	100.00% <100.00%> (ø)
packages/cdk/forms/src/useForms.ts	100.00% <100.00%> (ø)
packages/components/form/src/types.ts	100.00% <100.00%> (ø)

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