bug(Chip Input): matChipInputSeparatorKeyCodes won't recognize ";" and doesn't recognize pasted text

#### Reproduction

Use StackBlitz to reproduce your issue:
[https://stackblitz.com/edit/angular-cr3nwj?file=src/app/chips-autocomplete-example.ts](https://stackblitz.com/edit/angular-cr3nwj?file=src/app/chips-autocomplete-example.ts)

Steps to reproduce:
1. Using a mat-form-field with mat-chip-list and an input.
2. Declare the [matChipInputSeparatorKeyCodes]="separatorKeysCodes", with separatorKeysCodes: number[] = [ENTER, COMMA, SEMICOLON, 188];
3. Use a ";" in the input to trigger the chipEnd event. But i won't trigger. Neither by pressing the semicolon (EU Keyboard keys: shift + ,")
4. The input wont trigger the chipEnd after pasting text into the input and doesnt check for the separatorKeys in the pasted text.


#### Expected Behavior

The chipEnd event should be triggered after typing the Semicolon into to the input.
Also should pasted text be regnozed and processed based on the declared separatorKeys.
For example:
separatorKeys [COMMA]
Pasted text: "name1, name2, name3"
After pasting chipEnd event triggers and created 3 chips: "name1", "name2", "name3"

#### Actual Behavior
Semicolon doesn't trigger any event and will just display in the input.
Pasted text also doesn't trigger any event and will just display in the input.

#### Environment

- Angular: 11.0.0
- CDK/Material: 11.0.0
- Browser(s): Google Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): Windows 10 Pro

Inizia dal punto di ingresso StackBlitz in src/app/chips-autocomplete-example.ts e dall'input mat-chip-list configurato con matChipInputSeparatorKeyCodes. Traccia come viene attivato chipEnd per l'input da tastiera e il testo incollato. È completato quando l'inserimento di un punto e virgola attiva chipEnd e il testo incollato separato da virgole crea chip separati.

Scritto dal modello di indicizzazione a partire dal testo della issue.