feat: add alias command

[youkwhd]

---

• [x] I have reviewed CONTRIBUTING.md.
• [x] My commits and title use the Conventional Commit format.

• [x] I have documented changes and additions in the CHANGELOG.md.

  added a new alias shell command

reference: https://pubs.opengroup.org/onlinepubs/9699919799.2016edition/utilities/V3_chap02.html#tag_18_14

[TorchedSammy]

i'm actually not very sure that i want this to be added, since the syntax here for adding an alias is different to calling a function to do it, since it tries to imitate a posix shell. it might be useful for quickly looking at aliases though.

[youkwhd]

makes sense, that explains why the alias API itself is already existed

i will close this