feat(cdk/table): add optional footer to cdk-text-column/mat-text-column

Added two new inputs to CdkTextColumn:
`footerText` (string) and `footerTextTransform` (function), automatically
inherited by MatTextColumn.
If the table does not define a footer, the column footer will be ignored.
Additionally, TextColumnOptions includes a new default function called
`defaultFooterTextTransform`, used when neither `footerTextTransform` nor
`footerText` are provided.

Fixes #24532

Author: jullierme

tools/public_api_guard/cdk/table.md

@@ -412,10 +412,11 @@ export class CdkTextColumn<T> implements OnDestroy, OnInit {
     columnDef: CdkColumnDef;
     _createDefaultHeaderText(): string;
     dataAccessor: (data: T, name: string) => string;
-    headerCell: CdkHeaderCellDef;
-    headerText: string;
+    footerCell: CdkFooterCellDef;
     footerText: string;
     footerTextTransform: (name: string) => string;
+    headerCell: CdkHeaderCellDef;
+    headerText: string;
     justify: 'start' | 'end' | 'center';
     get name(): string;
     set name(name: string);
@@ -426,7 +427,7 @@ export class CdkTextColumn<T> implements OnDestroy, OnInit {
     // (undocumented)
     ngOnInit(): void;
     // (undocumented)
-    static ɵcmp: i0.ɵɵComponentDeclaration<CdkTextColumn<any>, "cdk-text-column", never, { "name": { "alias": "name"; "required": false; }; "headerText": { "alias": "headerText"; "required": false; }; "dataAccessor": { "alias": "dataAccessor"; "required": false; }; "justify": { "alias": "justify"; "required": false; }; }, {}, never, never, true, never>;
+    static ɵcmp: i0.ɵɵComponentDeclaration<CdkTextColumn<any>, "cdk-text-column", never, { "name": { "alias": "name"; "required": false; }; "headerText": { "alias": "headerText"; "required": false; }; "dataAccessor": { "alias": "dataAccessor"; "required": false; }; "footerText": { "alias": "footerText"; "required": false; }; "footerTextTransform": { "alias": "footerTextTransform"; "required": false; }; "justify": { "alias": "justify"; "required": false; }; }, {}, never, never, true, never>;
     // (undocumented)
     static ɵfac: i0.ɵɵFactoryDeclaration<CdkTextColumn<any>, [{ optional: true; }, { optional: true; }]>;
 }
@@ -595,8 +596,8 @@ export const TEXT_COLUMN_OPTIONS: InjectionToken<TextColumnOptions<any>>;
 // @public
 export interface TextColumnOptions<T> {
     defaultDataAccessor?: (data: T, name: string) => string;
-    defaultHeaderTextTransform?: (name: string) => string;
     defaultFooterTextTransform?: (name: string) => string;
+    defaultHeaderTextTransform?: (name: string) => string;
 }
 
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