fix: do not resize expand_macro buffer

[GordianDziwis]

This makes the expand_macro command a better fit for chaining it with layout commands.

[github-actions]

Review Checklist

Does this PR follow the Contribution Guidelines? Following is a partial checklist:

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• For example, fix(lsp): some lsp-related bugfix

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• Tested
  • Tests have been added.
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[mrcjkb]

Hmm, I'm fine with merging this, but to make the behaviour consistent, we should delete the ui.resize function (and its call sites) altogether.

This isn't a bug fix, so a fix: commit/PR prefix isn't appropriate here. It is, however, a breaking change, as it may come as an unwanted surprise to some users. So an appropriate commit message/PR title would be feat!(ui): don't resize split windows.
The commit body and PR description should explain how to reproduce the old behaviour (e.g. in a keymap).

I'm wondering if we should make the resize configurable (e.g. via a vim.g.rustaceanvim.tools.ui.resize option). I'm thinking YAGNI for now. We can add that if people complain.

Because it is a breaking change, I will hold off on merging this until I drop compatibility with Nvim 0.10 (which will be the next breaking change).