API: improve block.insert() interface to allow passing parameters as an object instead of set

1. Describe a problem.

The current interface of the `api.blocks.insert` accepts parameters as a list:

```ts
this.api.blocks.insert(
toolName,
undefined,
undefined,
index,
undefined,
currentBlock.isEmpty
);
```

2. Describe the solution you'd like. Mockups are welcome.

It would better to pass parameters as an object:

```ts
this.api.blocks.insert({
type: toolName,
index,
replace: currentBlock.isEmpty
});
```

**Important**. We need to save the backward capability.