Added Replacer class to simplify the creation of replacement expressions with MatchPy

[Upabjojr]

Replacer class is a wrapper around MatchPy's ManyToOneReplacer to simplify its usage in SymPy.

• utilities
  • Added Replacer class to simplify the creation of replacement expressions with MatchPy.

[sympy-bot]

✅

Hi, I am the SymPy bot (v161). I'm here to help you write a release notes entry. Please read the guide on how to write release notes.

Your release notes are in good order.

Here is what the release notes will look like:

• utilities
  • Added Replacer class to simplify the creation of replacement expressions with MatchPy. (#20794 by @Upabjojr)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.8.

Click here to see the pull request description that was parsed.

Replacer class is a wrapper around MatchPy's `ManyToOneReplacer` to simplify its usage in SymPy.

<!-- BEGIN RELEASE NOTES -->
* utilities
  * Added Replacer class to simplify the creation of replacement expressions with MatchPy.
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[Upabjojr]

@skirpichev