REF: refactor implementation of to_dict out of frame.py and into core.methods.to_dict

[kostyafarber]

• closes REF: Move to_dict implementation to pandas.core.methods.to_dict #49845 (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

Following #46487 (review) a decision was made to move the implementation of to_dict in frame.py into pandas.core.methods.to_dict.

[kostyafarber]

@rhshadrach friendly ping

[rhshadrach]

lgtm

[rhshadrach]

Thanks @kostyafarber! There are other methods that should now go in this directory - describe is one example. Would you be interested in continuing this kind of refactor?

[kostyafarber]

Hey @rhshadrach no worries, glad I can help - Yeah sure!

If you wanna open up an issue with a list of methods, I can open PRs against them and work on it.

[kostyafarber]

@rhshadrach shall I look into describe or are you compiling a list? Happy to work on describe in the meantime.

[rhshadrach]

@kostyafarber - I don't plan on compiling a list; I think describe would be great to work on.

[kostyafarber]

@rhshadrach describe.py currently is as a standalone file in core would the refactor simply be moving that file into methods?

[kostyafarber]

?

[rhshadrach]

@kostyafarber - thanks for the ping; yes, that's correct.