修改MongoDB拓展，增加常用方法 · Pull Request !423 · dotNET China/Furion

### 相关的 Issue
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### 描述（做了什么，变更了什么）
修改了MongoDB拓展，增加了一些常用方法
### 使用方法
1.  注册 MongoDB 服务
    使用非常简单，只需要在 Startup.cs 中添加 services.AddMongoDB 即可。如：
```csharp
    services.AddMongoDB("mongodb://localhost/dbName");
```
2.  基本使用

在使用之前，我们可以通过构造函数注入 IMongoDBRepository<TEntity, TKey> 接口，如：
```csharp
    private readonly IMongoDBRepository<Person, string> _personRep;
    public MongoService(IMongoDBRepository<Person, string> personRep)
    {
        _personRep = personRep;
    }
```
2.1 新增操作
```csharp
    var person = input.Adapt<Person>();
    await _personRep.InsertAsync(person);
```
2.2 批量新增操作
```csharp
    var list = input.Adapt<List<Person>>();
    await _personRep.BatchInsertAsync(list);
```
2.3 更新操作
```csharp
    var person = await _personRep.GetAsync(input.Id);
    _ = person ?? throw Oops.Oh("数据不存在！");
    input.Adapt(person);
    await _personRep.UpdateAsync(person);
```
2.4 删除操作
```csharp
    var person = await _personRep.GetAsync(id);
    _ = person ?? throw Oops.Oh("数据不存在！");
    var result=await _personRep.DeleteAsync(person.Id);
    return result.DeletedCount;
```
2.5 查询操作
```csharp
    Expression<Func<Person, bool>> where = (a)=>true;
    if (!string.IsNullOrWhiteSpace(input.Name))
    {
        where = where.And(a => a.Name.Contains(input.Name));
    }
    if (input.MinAge.HasValue)
    {
        where = where.And(a => a.Age >= input.MinAge);
    }
    var data = _personRep.Entities.Find(where).ToList();
    
    var data  = await _personRep.Entities.Find(where).ToListAsync(a => new
            {
                Name = a.Name
            });

var data  = await _personRep.Entities.Find(where).FirstOrDefaultAsync(a => new
            {
                Name = a.Name
            });
```
2.6 分页查询
```csharp
    var data = await _personRep.Entities.Find(where).ToPagedListAsync(input.PageIndex,input.PageSize);
```

Type	Assign personnel	Status
Reviewer	百小僧 Pass review	Completed (1/1 )
Tester	百小僧 Pass test	Completed (1/1 )

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