[RFC] git branch: add -s/--switch to create and switch to a new branch

Hi,

I'd like to propose adding a -s (--switch) option to `git branch`.

It makes sense semantically to create a branch and to also switch to it.

Currently, creating a new branch and immediately switching to it requires:

git switch -c newbranch

I'd like to propose an alternative:

git branch -s newbranch

My reasoning is simple: when I want to create a new branch, git branch is naturally the command I think of.

I want to create a branch and also switch to it. For me, switching is an additional action when creating the branch, rather than the primary operation.

The proposed option would behave like git switch -c, creating the branch and switching to it in one operation. It would fail if the branch already exists, just as git switch -c does.

I understand that git switch -c already supports this functionality, but I think the alternative syntax would be more intuitive for users who approach the operation from the branch-creation perspective.

Thanks! Johannes