refactor: fix typescript 3.7 compilation errors.Fixes Import declaration conflicts with local declaration error. (#18141)

(cherry picked from commit 7cced9c)

Author: andrius-pra

src/components-examples/material/table/table-multiple-header-footer/table-multiple-header-footer-example.ts

@@ -1,11 +1,6 @@
 import {Component} from '@angular/core';
 import {Transaction} from '../table-footer-row/table-footer-row-example';
 
-export interface Transaction {
-  item: string;
-  cost: number;
-}
-
 /**
  * @title Table with multiple header and footer rows
  */

src/dev-app/mdc-input/mdc-input-demo.ts

@@ -8,9 +8,11 @@
 
 import {ChangeDetectionStrategy, Component} from '@angular/core';
 import {FormControl, Validators} from '@angular/forms';
-import {ErrorStateMatcher, FloatLabelType} from '@angular/material/core';
-import {MatFormFieldAppearance} from '@angular/material-experimental/mdc-form-field';
-
+import {
+  FloatLabelType,
+  MatFormFieldAppearance
+} from '@angular/material-experimental/mdc-form-field';
+import {ErrorStateMatcher} from '@angular/material/core';
 
 let max = 5;
 

src/material-experimental/mdc-form-field/form-field.ts

@@ -26,7 +26,6 @@ import {
 } from '@angular/core';
 import {NgControl} from '@angular/forms';
 import {
-  FloatLabelType,
   LabelOptions,
   MAT_LABEL_GLOBAL_OPTIONS,
   ThemePalette