chore: codeowners need to match files (#5783)

* Currently the CODEOWNERS file only matches the directories and not directly the source files that are belonging to a specific owner.

.github/CODEOWNERS

@@ -1,64 +1,64 @@
 # Angular Material components
-lib/list                    @jelbourn @crisbeto
-lib/tooltip                 @andrewseguin
-lib/button-toggle           @tinayuangao
-lib/snack-bar               @jelbourn @crisbeto @josephperrott
-lib/radio                   @tinayuangao
-lib/card                    @jelbourn
-lib/input                   @mmalerba
-lib/progress-spinner        @jelbourn @crisbeto @josephperrott
-lib/datepicker              @mmalerba
-lib/sort                    @andrewseguin
-lib/autocomplete            @kara @crisbeto
-lib/chips                   @tinayuangao
-lib/icon                    @jelbourn
-lib/dialog                  @jelbourn @crisbeto
-lib/progress-bar            @jelbourn @crisbeto @josephperrott
-lib/grid-list               @kara @jelbourn
-lib/select                  @kara @crisbeto
-lib/expansion               @josephperrott @jelbourn
-lib/slide-toggle            @devversion
-lib/toolbar                 @devversion
-lib/button                  @tinayuangao
-lib/checkbox                @tinayuangao
-lib/table                   @andrewseguin
-lib/slider                  @mmalerba
-lib/sidenav                 @mmalerba
-lib/menu                    @kara @crisbeto
-lib/paginator               @andrewseguin
-lib/tabs                    @andrewseguin
+lib/list/**                    @jelbourn @crisbeto
+lib/tooltip/**                 @andrewseguin
+lib/button-toggle/**           @tinayuangao
+lib/snack-bar/**               @jelbourn @crisbeto @josephperrott
+lib/radio/**                   @tinayuangao
+lib/card/**                    @jelbourn
+lib/input/**                   @mmalerba
+lib/progress-spinner/**        @jelbourn @crisbeto @josephperrott
+lib/datepicker/**              @mmalerba
+lib/sort/**                    @andrewseguin
+lib/autocomplete/**            @kara @crisbeto
+lib/chips/**                   @tinayuangao
+lib/icon/**                    @jelbourn
+lib/dialog/**                  @jelbourn @crisbeto
+lib/progress-bar/**            @jelbourn @crisbeto @josephperrott
+lib/grid-list/**               @kara @jelbourn
+lib/select/**                  @kara @crisbeto
+lib/expansion/**               @josephperrott @jelbourn
+lib/slide-toggle/**            @devversion
+lib/toolbar/**                 @devversion
+lib/button/**                  @tinayuangao
+lib/checkbox/**                @tinayuangao
+lib/table/**                   @andrewseguin
+lib/slider/**                  @mmalerba
+lib/sidenav/**                 @mmalerba
+lib/menu/**                    @kara @crisbeto
+lib/paginator/**               @andrewseguin
+lib/tabs/**                    @andrewseguin
 
 # Angular Material core
-lib/core/selection          @tinayuangao @jelbourn
-lib/core/selection/pseudo*  @crisbeto @jelbourn
-lib/core/theming            @jelbourn
-lib/core/option             @kara @crisbeto
-lib/core/rxjs               @jelbourn
-lib/core/ripple             @devversion
-lib/core/a11y               @jelbourn
-lib/core/compatibility      @jelbourn
-lib/core/overlay            @jelbourn @crisbeto
-lib/core/overlay/scroll     @andrewseguin @crisbeto
-lib/core/platform           @jelbourn
-lib/core/bidi               @jelbourn
-lib/core/placeholder        @kara @mmalerba
-lib/core/portal             @jelbourn
-lib/core/typography         @crisbeto
-lib/core/datetime           @mmalerba
+lib/core/selection/**          @tinayuangao @jelbourn
+lib/core/selection/pseudo*/**  @crisbeto @jelbourn
+lib/core/theming/**            @jelbourn
+lib/core/option/**             @kara @crisbeto
+lib/core/rxjs/**               @jelbourn
+lib/core/ripple/**             @devversion
+lib/core/a11y/**               @jelbourn
+lib/core/compatibility/**      @jelbourn
+lib/core/overlay/**            @jelbourn @crisbeto
+lib/core/overlay/scroll/**     @andrewseguin @crisbeto
+lib/core/platform/**           @jelbourn
+lib/core/bidi/**               @jelbourn
+lib/core/placeholder/**        @kara @mmalerba
+lib/core/portal/**             @jelbourn
+lib/core/typography/**         @crisbeto
+lib/core/datetime/**           @mmalerba
 
 # CDK
-cdk/coercion                @jelbourn
-cdk/rxjs                    @jelbourn
-cdk/observe-content         @crisbeto @jelbourn
-cdk/a11y                    @jelbourn
-cdk/platform                @jelbourn
-cdk/bidi                    @jelbourn
-cdk/table                   @andrewseguin
-cdk/portal                  @jelbourn
+cdk/coercion/**                @jelbourn
+cdk/rxjs/**                    @jelbourn
+cdk/observe-content/**         @crisbeto @jelbourn
+cdk/a11y/**                    @jelbourn
+cdk/platform/**                @jelbourn
+cdk/bidi/**                    @jelbourn
+cdk/table/**                   @andrewseguin
+cdk/portal/**                  @jelbourn
 
 # Tooling
-src/tools                   @devversion @jelbourn
-test/                       @devversion @jelbourn
+src/tools/**                   @devversion @jelbourn
+test/**                        @devversion @jelbourn
 
 # Docs examples
-material-examples/          @amcdnl @jelbourn
+material-examples/**           @amcdnl @jelbourn