refactor(client): check name validation for keys add|import|rename (backport #18950)

[mergify]

Motivation

When I set the $name variable by mistake, and after running keys add $name command, it created a key with the empty name.

This looks odd when I ran keys list to check the created key, see the screenshot below. I'm confused about the name, is it empty or just the "" itself.

Also, an unnormal name isn't friendly to keys delete, keys show, and keys export subcommand.

So I think we should prevent from creating a key with an unnormal name

---

This is an automatic backport of pull request #18950 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of c307001 has failed:

On branch mergify/bp/release/v0.53.x/pr-18950
Your branch is up to date with 'origin/release/v0.53.x'.

You are currently cherry-picking commit c30700134.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   client/keys/add.go
	modified:   client/keys/add_test.go
	modified:   client/keys/import_test.go
	modified:   client/keys/rename.go
	modified:   client/keys/rename_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   client/keys/import.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally