### Store Class Constructor

The `Store` constructor creates a new instance of the `Store` class, which represents a file store with specific structure and functionality. It initializes the store with various configuration options provided through the `params` object.

#### Constructor Parameters and Validation:

- `params`: An object containing the following configuration parameters:
  - `dirPath` (String, required, 3-255 characters): Specifies the path to the directory where files will be stored. This parameter is validated to ensure it is a string with a length between 3 and 255 characters.
  - `schema` (Object, optional): A schema object used for validating files in the store. If provided, a new instance of `Schema` (als-schema package) is created with the provided schema. If not provided, no schema validation is used. 
  - `maxAge` (Number, optional, >= 1000): Specifies the maximum lifetime of a file in milliseconds. It is validated to be an optional numeric parameter with a minimum value of 1000.
  - `maxActiveAge` (Number, optional, >= 1000): Specifies the maximum active time of a file in milliseconds. Similar to `maxAge`, it is validated as an optional numeric parameter with a minimum value of 1000.

#### Additional Actions in the Constructor:

- Calls `ensureDirSync(dirPath)` to ensure the existence of the directory at the specified path.
- Initializes internal variables and states of the store, such as `results`, `errors` arrays, and the `options` object.

This constructor allows flexible and scalable setup of a file store, catering to various use cases with customizable parameters.


#### Usage example

```js
const Store = require('als-store');
const params = {
  dirPath = __dirname,
  schema = {name:String,ext:String,ext1:String},
  maxAge = 1000*60*60*30,
  maxActiveAge = 1000*60*60*7
}
const store = new Store(params)
```