feature: Add custom header for dio client

[castletaste]

Description

There is no option to add custom header

Desired Solution

it would be awesome to have a custom header for dio client

Additional Context

There are cases where an apk file should only be accessible only by token, for security reasons

[LiWenHui96]

@castletaste 使用 2.3.0 ，采用 downloadUri, saveName, downloadInterceptors, deleteOnError, lengthHeader, data, options 这些字段对 dio 进行粉饰。

[LiWenHui96]

v2.3.0 已发布，功能完成，并关闭issus。