Add deprecated file

[ytdHuang]

Description

This PR adds a file called src/deprecated.jl, which gathers all the deprecated functions which will be removed in the next major release.

In this case, we don't need to push a major release frequently because of deprecating some functionalities.

I saw this idea long time ago in some repo., I think it would be nice to have this for future development.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.80%. Comparing base (3357706) to head (ed74002).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #274      +/-   ##
==========================================
- Coverage   94.39%   93.80%   -0.60%     
==========================================
  Files          32       32              
  Lines        2428     2422       -6     
==========================================
- Hits         2292     2272      -20     
- Misses        136      150      +14     

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