(fix): Handle EDITOR with options

[kameshsampath]

When doing rpk cluster config edit leverage the editor options. For example if the EDITOR is set to code -w, then the rpk cluster config edit should run a editor command like code -w <cluster config tempfile.

The commit splits the EDITOR environment variable with options and appends the tempfile as the last argument.

Fixes: 17386

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v23.3.x
• v23.2.x

Bug Fixes

Leverage the editor($EDITOR) options using comandrpk cluster config edit.

Improvements

The developer can now set editor to something like EDITOR='code -wand run therpk cluster config edit` to be able to make the editor wait for the editing to be saved/discarded.

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[kameshsampath]

@rockwotj - I have squashed all my commits into one and that includes all our discussions. Please feel free to merge it.

[vbotbuildovich]

ducktape was retried in https://buildkite.com/redpanda/redpanda/builds/47117#018e9056-fbb8-4be7-ab80-31b8124a02a0

[rockwotj]

Thank you @kameshsampath for your contribution!