Support partly migrating patch resource

## Versions

```
the latest
```

## Problem Statement

Here's an example of this case:
1. User use patch resource to manage properties {P1, P2}
2. P1 is now supported in azurerm resource, so there might be plan-diff
3. Currently, since P2 is not supported, this resource can't be migrated,

## Expected User Experience

There's no plan-diff.

## Proposal

Migrate patch resource partly. In above example, only migrates P1 and P2 stays in the patch resource.

## References