Upgradation of Nebular Theme (4.4.0 to 9.0.1) wrt Angular (8.2.3 to 13.2.1)

While Upgradation of Nebular Theme(4.4.0 to 9.0.1) wrt Angular (8.2.3 to 13.2.1) I am facing following issues:

i)'nb-card-header' is not a known element:

If 'nb-card-header' is an Angular component, then verify that it is part of this module.
If 'nb-card-header' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
ii)No directive found with exportAs 'ngModel'.

[(ngModel)]="startupWizard.company.state" #state="ngModel">

iii)Can't bind to 'ngModel' since it isn't a known property of 'input'. [(ngModel)]="startupWizard.company.state" #state="ngModel">

I would like to know the best possible option to upgrade Nebular to Angular version 13?. Does latest version of Nebular 9.1 support angular 13?.If yes, how can we migrate the old components to the latest one.

### Issue type

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* [ ] bug report
* [ ] feature request

### Issue description

**Current behavior:**

**Expected behavior:**

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**Related code:**

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**Angular, Nebular**
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