能否让nz-form-control接受自定义的context来让ErrorTip更通用。

[HHHui]

What problem does this feature solve?

现在的nz-form-control中ErrorTip Template的context中只有当前的FormControl, 如果可以加上自定义的一些属性比如Input的Label，这样模板可以更加通用。

What does the proposed API look like?

<nz-form-item>
  <nz-form-label>IP</nz-form-label>
  <nz-form-control [nzErrorTip]="errorTpl" [nzTplContext]="{name: 'ip'}">
    <input formControlName="ip" nz-input placeholder="please enter ip" />
  </nz-form-control>
</nz-form-item>
<nz-form-item>
  <nz-form-label>Name</nz-form-label>
  <nz-form-control [nzErrorTip]="errorTpl" [nzTplContext]="{name: 'name'}">
    <input formControlName="name" nz-input placeholder="please enter name" />
  </nz-form-control>
</nz-form-item>

<ng-template #errorTpl let-control let-name="name">
  <ng-container *ngIf="control.hasError('required')">
    Please confirm your {{name}}!
  </ng-container>
</ng-template>
```<!-- generated by ng-zorro-issue-helper. DO NOT REMOVE -->

[zorro-bot]

Translation of this issue:

Can let nz-form-control context to accept the custom to make ErrorTip more versatile.

What problem does this feature solve?

context now nz-form-control in ErrorTip Template in only the current FormControl, if you can add some custom properties such as the Input Label, this template can be more versatile.

What does the proposed API look like?

`` `Html

   IP </ nz-form-label>
  <Nz-form-control [nzErrorTip] = "errorTpl" [nzTplContext] = "{name: 'ip'}">
    
  </ Nz-form-control>
</ Nz-form-item>

   Name </ nz-form-label>
  <Nz-form-control [nzErrorTip] = "errorTpl" [nzTplContext] = "{name: 'name'}">
    
  </ Nz-form-control>
</ Nz-form-item>

<Ng-template #errorTpl let-control let-name = "name">
  <Ng-container * ngIf = "control.hasError ( 'required')">
    Please confirm your {{name}}!
  </ Ng-container>
</ Ng-template>
`` `

[wenqi73]

Please track #4523.