feat: enable user sharing

[sonle-geekyants]

- What I did

issue #459

- How I did it

1. Write data
   On Windows, the biometric library is limited to 2560 characters per file.
   So when a String is too long, I will split it into a list of strings and save them in files one by one.
2. Read data
   When reading data, I will count the total number of files and then merge the contents of the files together.

- How to verify it

Check the change code and run the app on Windows.

- Description for the changelog

[murali-shris]

@sonle-geekyants please elaborate on the changes.sections how I did, how to verify ?
Please check the feasibility of writing unit tests to verify your code changes.

[sonle-geekyants]

I've done the unit test and added the comment for the ticket. Could you please check it? @murali-shris

[gkc]

@murali-shris can you review this again please? @sonle-geekyants has made changes in response to your review

[murali-shris]

I've done the unit test and added the comment for the ticket. Could you please check it? @murali-shris

@sonle-geekyants I don't see the unit tests. did you forget to commit ?

[sonle-geekyants]

No, because my change is private function so I don't write the unit test for it. And I see that now, the unit tests are using functions that have my changes so I thought that if they passed my edits would be correct as well. @murali-shris @gkc